Magnetic recording medium based on multiferroic film and write-in method thereof

A magnetic recording medium, multiferroic technology, applied in recording/reproducing/deleting methods, magnetic recording, data recording, etc., to achieve the effect of great application prospects

Inactive Publication Date: 2009-12-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to generate a sufficiently strong write magnetic signal, a certain number of coils are required, and there is inevitably a stray magnetic field in the write head, which makes it difficult to reduce the size of the write head, but with the increase of the magnetic recording density ( For example, in 1996 the magnetic recording density was 1Gbit/in 2 , now can reach 400Gb/in 2 ), requiring smaller size and higher sensitivity for the writing head and reading head, which poses new challenges to the writing method, and it is an inevitable trend to study the method of directly writing electrical signals into magnetic recording media
The traditional magnetic recording method is horizontal magnetic recording, that is, the magnetic domains are magnetized in the plane. Similarly, with the development of high-density storage, horizontal magnetic recording has encountered serious obstacles, because under high-density storage, horizontal magnetic recording is It is unstable, but perpendicular magnetic recording is stable under high-density storage, which makes horizontal magnetic recording gradually replaced by perpendicular magnetic recording. Correspondingly, perpendicular

Method used

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  • Magnetic recording medium based on multiferroic film and write-in method thereof
  • Magnetic recording medium based on multiferroic film and write-in method thereof
  • Magnetic recording medium based on multiferroic film and write-in method thereof

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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, niobium-doped strontium titanate (Nb:SrTiO 3 ) as the substrate 100, grown by the ferroelectric material Ba by magnetron sputtering or pulsed laser deposition 0.7 Sr 0.3 TiO 3 The ferroelectric structural unit 101 and the ferromagnetic material La 0.67 Sr 0.33 MnO 3 The formed ferromagnetic layer is then etched by an electron beam to obtain a ferromagnetic structural unit 102 .

[0038] The writing method of the above-mentioned magnetic recording medium based on the multiferroic thin film is as follows Figure 7 As shown, the signal source 200 generates a pulse electric signal, generates an electric field through the electrode 201, and the voltage is applied to the ferroelectric structural unit 203, thereby causing the ferroelectric structural unit 203 to generate electrical polarization, and the ferroelectric structural unit 203 and the ferromagnetic structural unit 202 The magnetoelectric coupling effect controls the magnetization dir...

Embodiment 2

[0046] Such as image 3 with Figure 4 The shown magnetic recording media based on multiferroic thin films, in Pt / Ti / SiO 2 / Si substrate, the single-phase multiferroic material BiFeO was prepared by magnetron sputtering or pulsed laser deposition 3 The formed dielectric layer 104 can be obtained by electron beam etching, ion beam etching and other methods such as Figure 4 The unit structure 105 .

[0047] The data writing method is the same as that in Embodiment 1.

[0048] Single-phase multiferroic materials can also use doped bismuth ferrite (BiFeO 3 ), such as: doped potassium (K), calcium (Ca), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), cobalt (Co), nickel (Ni) , copper (Cu), zinc (Zn), strontium (Sr), barium (Ba), yttrium (Y), niobium (Nb), lead (Pb), lanthanum (La), cerium (Ce), praseodymium (Pr) , neodymium (Nd), samarium (Sm), gadolinium (Gd), terbium (Tb) or ytterbium (Yb).

Embodiment 3

[0050] Such as Figure 5 The magnetic recording medium based on the multiferroic thin film shown, on the niobium-doped strontium titanate substrate 100, the multiferroic thin film magnetic film with the 1-3 type structure is grown uniformly at intervals by the method of pulsed laser deposition and self-assembly. Recording medium (cobalt ferrite nanopillars 106 embedded in bismuth ferrite ferroelectric matrix 107).

[0051] All the other parts are identical with embodiment 1.

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Abstract

The invention relates to a magnetic recording medium based on a multiferroic film, comprising a substrate and a medium layer growing on the substrate. The medium is characterized in that the medium layer comprises a ferroelectric structure unit formed by a ferroelectric material and a ferromagnetic structure unit formed by a ferromagnetic material. The write-in method comprises the following steps: an electric signal generated by a signal source is applied to two ends of the ferroelectric structure unit; an impulse voltage signal generated by the signal source changes the polarized state of a ferroelectric layer; through a magnetoelectric coupling effect, changes of the polarized state can further change the magnetization direction in the ferroelectric structure unit so as to record the state of an electric signal and complete information storage. Compared with the prior art, the invention provides the novel magnetic recording medium of the multiferroic composite material and several structures for recording the medium based on the traditional magnetic recording medium; and the medium using the multiferroic materials for recording can realize the magnetic recording method for electric write-in, and has wide application prospect for novel multifunctional devices with high density storage.

Description

technical field [0001] The invention relates to a magnetic recording medium and a writing method thereof, in particular to a magnetic recording medium based on a multiferroic composite thin film and a magnetic recording method using electric writing. Background technique [0002] With the continuous development of society, the exchange of information has become more and more important, and the exponential growth of information has higher and higher requirements for information storage. Magnetic recording technology was born in 1898. As a traditional information recording technology, magnetic recording technology continues to accept the challenge of high-capacity information storage, and has continuously made leapfrog progress in recording media and read heads. Magnetic recording technology occupies a pivotal position in the field of information storage by virtue of the advantages of high storage density, large storage capacity, high speed and low price. [0003] Magnetic re...

Claims

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Application Information

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IPC IPC(8): G11B5/62C22C29/00C22C19/07C22C38/10C04B35/468C04B35/472C04B35/491C04B35/46C04B35/495C04B35/453C04B35/01G11B5/09
Inventor 李润伟刘宜伟尹奎波陈斌李蜜
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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