Hexagonal ferrite designed to have the optimal combination of permeability and loss at 750 mhz

Abstract

A hexagonal Y-phase ferrite material that has a permeability (μ') that is in the range of 5 to 9 and a gyromagnetic resonant frequency that occurs at or above 1 GHz. The hexagonal Y-phase ferrite material may have an elemental formula that identifies a number of formula units for each element in the formula; the elemental formula (F-1 ) comprising: A2-X Dx (Co1-y Ey)2-X Gx Fe12 O22 (F-1 ) wherein the number of formula units are defined by 0 ≤ x ≤ 1 and 0 < y ≤ 1. The A in the formula may Sr and / or B, while D is Na and / or K, The E represents a divalent metal comprising Co, Mg, Ca, Mn, Ni, Fe, Cd, Zn, or a combination thereof, and G is a trivalent metal comprising Sc, Al, Ga In, Y, Cr, Mn, Co, a lanthanide element, or a combination thereof.

Description

HEXAGONAL FERRITE DESIGNED TO HAVE THE OPTIMAL COMBINATION OF PERMEABILITY AND LOSS AT 750 MHzField

[0001] The present disclosure generally relates to hexagonal Y-phase ferrite materials having a permeability (p‘) that is in the range of 5 to 9 and a gyromagnetic resonance frequency that occurs at or above 1 GHz. The present disclosure further relates to a magnetic assembly, for example, such as an inductor or an antenna, which is either a sintered ceramic part or a composite that incorporates said hexagonal Y-phase ferrite materials.Background

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] The materials used in magnetodielectric antenna applications, are generally selected to have a high magnetic permeability (p’) to increase the efficiency and the bandwidth of operation, while at the same time making miniaturization possible. Similarly, the materials used in inductor applications are generally selected to have as high a permeability value (p’) and as low a magnetic loss tangent (tan 5) as possible. It is also desirable for the material to be an insulator to minimize eddy current losses which often occur in conductive materials.

[0004] However, conventional materials that exhibit higher permeability also tend to have low magnetic resonance frequencies, while materials with high magnetic resonance frequencies tend to have low permeability. For example, a conventional material operating at a resonant frequency above 1 GHz will have a permeability of only 2. Although previous solutions have been developed to increase the permeability of these materials, they have also resulted in limiting the maximum useable frequency of the materials to about 500 MHz.

[0005] In addition, since the antenna miniaturization factor for conventional materials is proportional to the square root of the product of the material’s permeability and permittivity at a predetermined frequency, it is generally desirable that the material be anAttorney Docket No. 106191-170insulator to have a permeability greater than or equal to the permittivity for maximum efficiency with a permittivity and permeability that is as close to one another as possible in order to minimize any impedance mismatch (and reflection losses) to free space. Unfortunately, there are not any available insulating magnetic materials that exhibit a high permeability above 700 MHz and that also exhibit appreciably low losses. Thus, improving the permeability of magnetic materials at high operating frequencies is necessary and desirable for the use of said materials in a variety of commercial inductor and antenna applications.Summary

[0006] According to one aspect of the present disclosure, a hexagonal Y-phase ferrite material having an elemental formula that identifies a number of formula units for each element in the formula is provided. This elemental formula (F-1) comprises:A2-X Dx(COi-yEy)2-x GxFe-12 O22; (F-1 )wherein the number of formula units are defined by 0 < x < 1 and 0 < y < 1. In this elemental formula A represents strontium Sr and / or barium B, D is sodium Na and / or potassium K, E is a divalent metal selected as one from the group consisting of cobalt Co, magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, zinc Zn, or a combination thereof, and G is a trivalent metal selected as one from the group consisting of scandium Sc, aluminum Al, gallium Ga, indium In, yttrium Y, chromium Cr, manganese Mn, cobalt Co, a lanthanide element, or a combination thereof. This hexagonal Y-phase ferrite material has a permeability |i‘ that is in the range of 5 to 9 and a gyromagnetic resonant frequency that occurs at or above 1 GHz. The hexagonal Y-phase ferrite material may be configured as an electromagnetic absorber at frequencies of 1.5 GHz or more.

[0007] Alternatively, the E in the hexagonal Y-phase ferrite material is one or more of magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E present in the elemental formula is greater than the amount of Co. Alternatively, the E is one or more of magnesium Mg, calcium Ca, manganese Mn, nickelAttorney Docket No. 106191-170Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E present in the elemental formula is less than the amount of Co. Alternatively, this hexagonal ferrite may include one or more of the following:i) A is strontium Sr, D is sodium Na, E is zinc Zn, and G is scandium Sc; ii) x is greater than zero;iii) the permeability is in the range of 7 to 8;iv) 0.3 < x < 0.5 and 0.3 < y < 0.7; andv) 0.4 < y < 0.6 and x is about 0.4.

[0008] According to another aspect of the present disclosure, the elemental formula of the hexagonal Y-phase ferrite material may be defined as one of the following:Sri.6Nao.4Coo.6 Zno.96Sco.4Fei2022; (F-2) Sfl.6Na0.4CO0.96Zn0.64SC0.4Fei 2022- (F-3)

[0009] According to yet another aspect of the present disclosure a magnetic assembly that comprises the hexagonal Y-phase ferrite material as described above and as further defined herein is provided. This magnetic assembly may be configured for use in an inductor application or in an antenna application. The magnetic assembly may be configured for use at frequencies up to 1.5 GHz. In this magnetic assembly, the hexagonal Y-phase ferrite material is present in a sintered form or shape.

[0010] According to another embodiment, the hexagonal Y-phase ferrite material may a powder present with a non-magnetic material in the form of a composite. This nonmagnetic material may be an organic polymer, an inorganic material, or a mixture thereof. This composite may comprise from 1 to 90 vol.% of the powder and from 99 to 10 vol.% of the non-magnetic material. Alternatively, the composite may comprise from 10 to 80 vol.% of the powder and from 90 to 20 vol.% of the non-magnetic material.

[0011] Further areas of applicability will become apparent from the description provided herein. The description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.Attorney Docket No. 106191-170Drawings

[0012] In order that the disclosure may be well understood, there will now be described various forms thereof, given by way of example, reference being made to the accompanying drawings.

[0013] Fig. 1 is a graphical comparison of the real permeability component (p’) for a conventional ferrite material and multiple examples of hexagonal Y-phase ferrite materials formed according to the teachings of the present disclosure plotted as a function frequency.

[0014] Fig. 2 is a graphical comparison of the imaginary permeability component (p”) for a conventional ferrite material and multiple examples of hexagonal Y-phase ferrite materials formed according to the teachings of the present disclosure plotted as a function frequency.

[0015] Fig. 3 is a graphical comparison of the magnetic loss tangent (tan 5m) for a conventional ferrite material and multiple examples of hexagonal Y-phase ferrite materials formed according to the teachings of the present disclosure plotted as a function frequency.

[0016] Fig. 4A is a perspective view of a hexagonal Y-phase ferrite material formed into a shape according to the teachings of the present disclosure.

[0017] Fig. 4B is a perspective view of a magnetic assembly that incorporates a hexagonal Y-phase ferrite material formed according to the teachings of the present disclosure.

[0018] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. Throughout the description and drawings, corresponding reference numerals indicate like or corresponding parts and features.Detailed Description

[0019] The following description is merely exemplary in nature and is in no way intended to limit the present disclosure or its application or uses. For example, the hexagonal Y-phase ferrite materials prepared and used according to the teachings contained herein are described throughout the present disclosure for use in a magneticAttorney Docket No. 106191-170assembly, such as an inductor or antenna, in order to more fully illustrate the structural elements and the use thereof. The incorporation and use of such hexagonal Y-phase ferrite materials in a variety of applications, such as, for example, in any telecommunication, aerospace, and medical devices, that may require or would benefit from the incorporation of magnetic materials that exhibit a high level of permeability at high frequencies is contemplated to be within the scope of the present disclosure.

[0020] The present disclosure generally provides hexagonal Y-phase ferrite materials that correspond to an elemental formula as shown in formula (F-1) below. This formula (F-1) identifies each element and a number of formula units for each of the elements in the hexagonal Y-phase ferrite material.A2-X Dx(Coi-yEy)2-x GxFei2 O22 (F-1 )

[0021] In formula (F-1 ) the element represented by A may be strontium Sr, barium B, or a combination thereof. Alternatively, element A is either strontium or barium. Alternatively, the element A is selected to be strontium.

[0022] The element represented by D in formula (F-1) may be selected to be sodium Na, potassium K, or a combination thereof. Alternatively, element D is either sodium or potassium. Alternatively, the element D is selected to be sodium.

[0023] The element represented by E in formula (F-1 ) is a divalent metal. This divalent metal may be selected as one from the group consisting of cobalt Co, magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, zinc Zn, or a combination thereof. Alternatively, the element E is selected as either cobalt Co or zinc Zn. Alternatively, the element E is selected to be zinc.

[0024] The element represented by G in formula (F-1) is a trivalent metal. This trivalent metal may be selected as one from the group consisting of scandium Sc, aluminum Al, gallium Ga, indium In, yttrium Y, chromium Cr, manganese Mn, cobalt Co, a lanthanide element, or a combination thereof. Alternatively, the element G is selected as being scandium Sc along with at least one additional element selected from the preceding list. Alternatively, the element G is selected to be scandium Sc.

[0025] Alternatively, the element E is one or more of magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E presentAttorney Docket No. 106191-170in the elemental formula (F-1 ) is greater than the amount of cobalt Co. Alternatively, the element E is one or more of magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E present in the elemental formula (F-1 ) is less than the amount of cobalt Co.

[0026] The formula units for each of the elements in formula (F-1) may be defined by x and y, wherein 0 < x < 1 and 0 < y < 1. Alternatively, x is greater than zero. Alternatively, both x and y are greater than 0.2. Alternatively, 0.3 < x < 0.5 and 0.3 < y < 0.7. Alternatively, 0.4 < y < 0.6 and x is about 0.4.

[0027] The hexagonal Y-phase ferrite material formed according to formula (F-1) has a permeability (p‘) that is in the range of 5 to 9 and a gyromagnetic resonant frequency that occurs at or above 1 GHz. Alternatively, the permeability p’ of the hexagonal Y-phase ferrite material is in the range of 7 to 8. The hexagonal Y-phase ferrite material according to formula (F-1) may be configured such that it is an electromagnetic absorber at frequencies of 1.5 GHz or more. Alternatively, the resonant frequency for the hexagonal Y-phase ferrite material is at least 900 MHz; alternatively, 950 MHz or greater; alternatively, greater than 1 GHz.

[0028] When desirable, the hexagonal Y-phase material may be defined according to the elemental formula shown below in either formula (F-2) or formula (F-3). In this embodiment of the present disclosure, A is strontium Sr, C is sodium Na, E is zinc Zn, and G is scandium Sc.Sri.6Nao.4Coo.64Zno.96Sco.4Fei2022 (F-2) Sri.6Nao.4Coo.96Zno.64Sco.4Fei2022 (F-3)

[0029] To demonstrate the composition and properties of the hexagonal Y-phase ferrite materials of the present disclosure, a total of three different compositions (Ex-1, Ex-2, & Ex-3) were prepared and tested. The properties of these different compositions were then compared against the properties exhibited by a conventional hexagonal Z-phase ferrite material (C-1). The composition of each of the samples (E-1 to E-3; C-1) are described below in Table 1.Attorney Docket No. 106191-170

[0030] Table 1 . Description of Different Hexagonal Ferrite Material CompositionsElemental FormulaEx-1Ex-2Ex-3C-1

[0031] The hexagonal Y-phase ferrite materials of the present disclosure may be formed using any known or available ceramic techniques. These techniques may include, without limitation, sol-gel autocombustion, solid-state reactions, such as, for example, the reaction of alkaline earth carbonates with metal oxides, or by co-precipitation or ultrasonically assisted co-precipitation, to name a few.

[0032] Referring to Fig.1 , a graphical comparison of the real permeability component (p’) plotted as a function of frequency fora conventional ferrite material (C-1) and multiple examples of hexagonal Y-phase ferrite materials (Ex-1 to Ex-3) formed according to the teachings of the present disclosure is provided. In general, for a material configured to operate at high frequencies the magnetic permeability of this material is typically expressed as a complex number, which includes both a real component (p’) and an imaginary component (p”). The real permeability (p’) of a material describes the inductive component of a magnetic material's response to an applied magnetic field. In other words, the real permeability (p’) provides an indication as to whether or not the material efficiently supports the development of a magnetic field without the occurrence of significant energy losses.

[0033] In Fig. 1, the real permeability (p’) of a conventional hexagonal Z-phase ferrite material (C-1) is shown to exhibit a relatively constant value of about 10 over a limited frequency range of 1 MHz to about 400 MHz with a substantial increase occurring thereafter. In comparison, the hexagonal Y-phase ferrite materials (Ex-1, Ex-2, & Ex-3) exhibit a relatively constant value for real permeability (p’) in the range of 5 to 9 over a much larger frequency range.Attorney Docket No. 106191-170

[0034] Referring now to Fig. 2, a graphical comparison of the imaginary permeability component (p”) plotted as function of frequency for a conventional ferrite material (C-1) and multiple examples of hexagonal Y-phase ferrite materials (Ex-1 to Ex-3) formed according to the teachings of the present disclosure is provided. The imaginary permeability component (p”) of a material generally describes the dissipative behavior of the material and provides an indication of the amount of magnetic energy that is lost or converted to other energy forms, such as heat, through the occurrence of eddy currents or magnetic hysteresis.

[0035] In Fig. 2, the imaginary permeability component (p”) exhibited by a conventional hexagonal Z-phase ferrite material (C-1) at higher frequencies is shown to substantially larger than the imaginary permeability component (p”) exhibited by the hexagonal Y-phase ferrite materials (Ex-1 to Ex-3) at the same high frequencies, e.g., up to at least 1,000 MHz or 1 GHz.

[0036] Referring now to both Fig. 1 and Fig. 2, several general trends relative to the hexagonal Y-phase ferrite materials (Ex-1 to Ex-3) prepared according to the teachings of the present disclosure are observed. More specifically, the higher the zinc Zn content (Ex-1 > Ex-2 > Ex-3) in the hexagonal Y-phase ferrite material leads to a material that exhibits a higher magnetic permeability. In this regard the magnetic permeability of the Y-phase ferrite materials in the order of low Zn content to high Zn content is about 7.5 (Ex-1), about 7.0 (Ex-2), and about 5.9 (Ex-3). Similarly, higher zinc Zn content (Ex-1 > Ex-2 > Ex-3) in the hexagonal Y-phase ferrite material leads to a material that exhibits stability of magnetic permeability over a lower operational frequency range. In other words, the operational frequency range for the hexagonal Y-phase ferrite materials is shown to follow the order of Ex-3 > Ex-2 > Ex-1.

[0037] For a material to be used in inductor applications, it is desirable that the material to be an insulator to minimize eddy current losses, which occur in conductive materials. The hexagonal Y-phase ferrite materials of the present disclosure are such ceramic insulators. In addition, the magnetic material used in such applications should also have as high a real permeability (p’) value as possible and as low a magnetic loss tangent (tan 5m) as possible.Attorney Docket No. 106191-170

[0038] Referring now to Fig. 3, a graphical comparison of the magnetic loss tangent (tan 6m) plotted as a function of frequency for a conventional ferrite material and multiple examples of hexagonal Y-phase ferrite materials formed according to the teachings of the present disclosure is provided. In Fig. 3, the magnetic loss tangent (tan 6m) exhibited by a conventional hexagonal Z-phase ferrite material (C-1 ) at higher frequencies is shown to be substantially larger than the magnetic loss tangent (tan 6m) exhibited by the hexagonal Y-phase ferrite materials (Ex-1 to Ex-3) at the same high frequencies, e.g., up to at least 1,000 MHz or 1 GHz. Since the magnetic loss tangent (tan 6m) exhibited by the hexagonal Y-phase ferrite materials of the present disclosure are low compared to conventional materials as shown in Fig. 3 and the real permeability (nT) of these same materials are high, i.e. , 5 to 9, alternatively, 7-8, the hexagonal Y-phase ferrite materials of the present disclosure are suitable for use in high frequency inductor applications, as well as antenna applications.

[0039] For a material to be used in magnetodielectric antenna applications, it is desirable that the material has a high magnetic permeability to increase the efficiency and bandwidth while also making miniaturization possible. The desired magnetic permeability and frequency range has been established for the hexagonal Y-phase ferrite materials of the present disclosure as discussed above and shown in Figs. 1 and 2. With respect to miniaturization, a miniaturization factor may be expressed according to Equation 1 (Eq-1). In addition, efficiency may be expressed according to Equation 2 (Eq-2). In both Equation 1 (Eq-1) and Equation 2 (Eq-2), the term e’ represents the dielectric constant of the material. The dielectric constant e’ of a hexagonal Y-phase ferrite material is generally about 12. Thus, using an insulating magnetic material, such as the hexagonal Y-phase ferrite materials of the present disclosure for an antenna application allows for miniaturization without sacrificing efficiency or bandwidth.Miniaturization: deff(Eq-1) Efficiency: h = h0(|17 E')1 / 2(Eq-2)

[0040] Referring now to Figs. 4A and 4B, according to another aspect of the present disclosure, a magnetic assembly 5 is provided that incorporates the hexagonal Y-phaseAttorney Docket No. 106191-170ferrite materials 10 as previously described above and as further defined herein. This magnetic assembly 5 may be configured for use in an inductor application or in an antenna application. The magnetic assembly 5 may also be configured for use at frequencies up to 1.5 GHz; alternatively, up to about 1.25 GHz; alternatively, at least 1 GHz; alternatively, at least 950 MHz; alternatively, 900 MHz or greater. When desirable, the hexagonal Y-phase ferrite materials 10 may be incorporated into a magnetic assembly 5 either in a sintered shaped form 15 or as a ferrite powder 10 mixed with a nonmagnetic material 25 in the form of a composite 30. The shaped form may include, but not be limited to, a cylinder, a rod, or a disk.

[0041] The formation of a component in a magnetic assembly 5 formed of the hexagonal Y-phase ferrite material 10 in sintered form 15 may be accomplished using any known or available manufacturing process. Various processes that may be involved in forming a component in sintered form 15 may include but not be limited to pulverizing, melting, compacting, molding, heating or sintering, cooling, and machining, An example of such a process sequence may involve, without limitation, forming a ferrite powder, mixing the ferrite powder with a binder; molding the ferrite-binder mixture into a component have the desired shape, removing the binder from the shaped component; and sintering the shaped component.

[0042] The formation of a component in a magnetic assembly 5 in a composite form 30 may comprise dispersing the hexagonal Y-phase ferrite material 10 as a powder along with a non-magnetic material 25. The non-magnetic material 25 may be an organic polymer, an inorganic material, or a mixture thereof. The mixture of the ferrite powder 10 and non-magnetic material 25 may then be formed into a shaped composite 30 using a known manufacturing technique, including without limitation, molding, casting, pultrusion, and vacuum infusion, to name a few. The amount of the ferrite powder 10 and nonmagnetic material 25 used to form the composite 30 may range from 1 to 90 vol.% of the powder and from 99 to 10 vol.% of the non-magnetic material based on the overall volume of the composite. Alternatively, the amount of the ferrite powder 10 and non-magnetic material 25 used to form the composite 30 may range from 10 to 80 vol.% of the powder and from 90 to 20 vol.% of the non-magnetic material based on the overall volume of theAttorney Docket No. 106191-170composite. Alternatively, the amount of ferrite powder in the composite is at least 50 vol.%; alternatively, at least 60 vol.%; alternatively, at least 70 vol.%.

[0043] Within this specification, embodiments have been described in a way which enables a clear and concise specification to be written, but it is intended and will be appreciated that embodiments may be variously combined or separated without parting from the invention. For example, it will be appreciated that all preferred features described herein are applicable to all aspects of the invention described herein.

[0044] Conditional language, such as “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include or do not include, certain features, elements, and / or steps. Thus, such conditional language is not generally intended to imply that features, elements, and / or steps are in any way required for one or more embodiments.

[0045] For this disclosure, the terms "at least one" and "one or more of” an element are used interchangeably and may have the same meaning. These terms, which refer to the inclusion of a single element or a plurality of the elements, may also be represented by the suffix "(s)"at the end of the element. For example, "at least one metal", "one or more metals", and "metal(s)" may be used interchangeably and are intended to have the same meaning.

[0046] Language of degree used herein, such as the terms “approximately,” “about,” “generally,” and “substantially” as used herein represent a value, amount, or characteristic close to the stated value, amount, or characteristic that still performs a desired function or achieves a desired result. For example, the terms “approximately”, “about”, “generally,” and “substantially” may refer to an amount that is within less than or equal to 10% of, within less than or equal to 5% of, within less than or equal to 1% of, within less than or equal to 0.1% of, and within less than or equal to 0.01% of the stated amount. The terms "about" and "substantially" may also be used herein with respect to measurable values and ranges due to expected variations known to those skilled in the art (e.g., limitations and variability in measurements).

[0047] Those skilled-in-the-art, in view of the present disclosure, will appreciate that many changes can be made in the specific embodiments which are disclosed herein andAttorney Docket No. 106191-170still obtain a like or similar result without departing from or exceeding the spirit or scope of the disclosure. One skilled-in-the-art will further understand that any properties reported herein represent properties that are routinely measured and can be obtained by multiple different methods. The methods described herein represent one such method and other methods may be utilized without exceeding the scope of the present disclosure.

[0048] Additional information regarding the preparation and properties of hexagonal ferrite materials and details relative to their use in various applications may be obtained from U.S. Patent No. 11,551,837 B2, U.S. Patent No. 11,742,118 B2 and U.S. Patent No.11 ,869,689 B2. The content of each of these patents is hereby incorporated by reference in their entirety.

[0049] The foregoing description of various forms of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Numerous modifications or variations are possible in light of the above teachings. The forms discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various forms and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.

Claims

Attorney Docket No. 106191-170Claims1. A hexagonal Y-phase ferrite material having an elemental formula that identifies a number of formula units for each element in the formula; the elemental formula (F-1) comprising:A2-X Dx(Coi-yEy)2-x Gx Fei2 O22; (F-1) wherein the number of formula units are defined by 0 < x < 1 and 0 < y < 1 ; wherein A is strontium Sr and / or barium B, D is sodium Na and / or potassium K, E is a divalent metal selected as one from the group consisting of cobalt Co, magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, zinc Zn, or a combination thereof, and G is a trivalent metal selected as one from the group consisting of scandium Sc, aluminum Al, gallium Ga, indium In, yttrium Y, chromium Cr, manganese Mn, cobalt Co, a lanthanide element, or a combination thereof;wherein the hexagonal Y-phase ferrite material has a permeability that is in the range of 5 to 9 and a gyromagnetic resonant frequency that occurs at or above 1 GHz.

2. The hexagonal Y-phase ferrite material according to claim 1 , wherein A is strontium Sr, D is sodium Na, E is zinc Zn, and G is scandium Sc.

3. The hexagonal Y-phase ferrite material according to any of claims 1 or 2, wherein x is greater than zero.

4. The hexagonal Y-phase ferrite material according to any of claims 1 to 3, wherein the permeability of the hexagonal Y-phase ferrite material is in the range of 7 to 8.

5. The hexagonal Y-phase ferrite material according to any of claims 1 to 4, wherein 0.3 < x < 0.5 and 0.3 < y < 0.7.

6. The hexagonal Y-phase ferrite material according to any of claims 1 to 5, wherein 0.4 < y < 0.6 and x is about 0.4.Attorney Docket No. 106191-1707. The hexagonal Y-phase ferrite material according to any of claims 1 to 6, wherein E is one or more of magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E present in the elemental formula is greater than the amount of Co.

8. The hexagonal Y-phase ferrite material according to any of claims 1 to 6, wherein E is one or more of magnesium Mg, calcium Ca, manganese Mn, nickel Ni, iron Fe, cadmium Cd, or zinc Zn, and the amount of E present in the elemental formula is less than the amount of Co.

9. The hexagonal Y-phase ferrite material according to any of claims 1 to 7, wherein the elemental formula is defined by the following formula:Sri.6Nao.4Coo.64Zno.96Sco.4Fei2022. (F-2)10. The hexagonal Y-phase ferrite material according to any of claims 1 to 6 or 8, wherein the elemental formula is defined by the following formula:Sri.6Nao.4Coo.96Zno.64Sco.4Fei2022. (F-3)11. The hexagonal Y-phase ferrite material according to any of claims 1 to 10, wherein the hexagonal Y-phase ferrite material is configured as an electromagnetic absorber at frequencies of 1.5 GHz or more.

12. A magnetic assembly that comprises the hexagonal Y-phase ferrite material according to any of claims 1 to 11.

13. The magnetic assembly according to claim 12, wherein the magnetic assembly is configured for use in an inductor application or in an antenna application.

14. The magnetic assembly according to any of claims 12 or 13, wherein the magnetic assembly is configured for use at frequencies up to 1.5 GHz.Attorney Docket No. 106191-17015. The magnetic assembly according to any of claims 12 to 14, wherein the hexagonal Y-phase ferrite material is present in a sintered form or shape.

16. The magnetic assembly according to any of claims 12 to 14, wherein the hexagonal Y-phase ferrite material is a powder present with a non-magnetic material in the form of a composite.

17. The magnetic assembly according to claim 13, wherein the non-magnetic material is an organic polymer, an inorganic material, or a mixture thereof.

18. The magnetic assembly according to any of claims 13 or 14, wherein the composite comprises from 1 to 90 vol.% of the powder and from 99 to 10 vol.% of the non-magnetic material.

19. The magnetic assembly according to any of claims 13 to 15, wherein the composite comprises from 10 to 80 vol.% of the powder and from 90 to 20 vol.% of the non-magnetic material.

Images