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Method of preparing Cr<3+>-doped CoFe2O4 high-density magnetic-recording material

A magnetic recording, high-density technology, applied in chemical instruments and methods, inorganic chemistry, cobalt compounds, etc.

Active Publication Date: 2015-12-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as we know, the CoFe obtained by the above two methods 2 o 4 The coercivity does not exceed the 5.1kOe prepared by Liu et al.

Method used

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  • Method of preparing Cr&lt;3+&gt;-doped CoFe2O4 high-density magnetic-recording material
  • Method of preparing Cr&lt;3+&gt;-doped CoFe2O4 high-density magnetic-recording material
  • Method of preparing Cr&lt;3+&gt;-doped CoFe2O4 high-density magnetic-recording material

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Embodiment Construction

[0019] A preparation of Cr 3+ Doped CoFe 2 o 4 The concrete steps that the method for high-density magnetic recording material adopts are as follows:

[0020] Step 1. Weigh an appropriate amount of NaOH particles and dissolve them in deionized water to obtain a clear solution of NaOH as a precipitant. The concentration of the NaOH solution is 0.4mol / L-0.6mol / L;

[0021] Step 2: Weigh 0.0055mol of CoCl 2 ·6H 2 O, a certain proportion of CrCl 3 ·6H 2 O, FeCl 3 ·6H 2 O (the total amount of the two substances is 0.011mol, and the molar ratio of each component is Fe / Cr=2:0, 1.6:0.4, 1.5:0.5, 1.4:0.6, 1.2:0.8, 0.8:1.2) fully dissolved In deionized water, a metal salt ion solution is obtained, and the concentration of the metal ion solution is 0.15mol / L-0.25mol / L;

[0022] Step 3, drop the NaOH solution obtained in step 1 into the metal salt ion solution obtained in step 2, and stir for 30 minutes;

[0023] Step 4, pour the mixture obtained in Step 3 into the autoclave and ...

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Abstract

A method of preparing a Cr<3+>-doped CoFe2O4 high-density magnetic-recording material belongs to the technical field of preparation of magnetic-recording materials. In the method, Cr<3+> is doped into metal oxides through a hydrothermal method, so that size of product particles is changed. In a spinel ferrite structure, iron ions are subjected to crystal field to cause quenching of orbital angular momentum, which leads to low magnetic crystal anisotropy and a low coercive force. As a result, by means of the Cr<3+>, of which the orbital angular momentum is not quenched, for doping the CoFe2O4, the CoFe2O4 is improved in magnetic crystal anisotropy. By means of the hydrothermal method, the Cr<3+> is doped with the CoFe2O4, so that two methods of size controlling and element doping are combined, thereby further increasing the coercive force of the magnetic medium. During the process of doping the Cr<3+>, with increase of the doping amount of the Cr<3+>, the product is gradually increased in magnetic crystal anisotropy, and meanwhile, the size of the particles is gradually changed, and when the size is in single-domain critical size range (about 40-100 nm), the product reaches a peak value in the coercive force. The method can further increase the coercive force of the magnetic medium, and is economical and convenient and is easy to popularize.

Description

technical field [0001] The present invention relates to a kind of preparation Cr 3+ Doped CoFe 2 o 4 A method for high-density magnetic recording materials belongs to the technical field of preparation of magnetic recording materials. Background technique [0002] With the rapid development of the electronic information industry, the demand for high-density and large-capacity magnetic recording materials is increasing. According to Bertram's magnetic recording theory, the upper limit of the magnetic recording density of a magnetic medium is proportional to the second third of its own coercive force. This means that high coercivity is an essential property of high-density magnetic recording materials. In daily life, conventional magnetic recording materials such as γ-Fe 2 o 3 , CrO 2 , Co-γ-Fe 2 o 3 However, this requirement cannot be met. Therefore, the preparation of new high-density magnetic recording materials is still an important topic in the field of material...

Claims

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Application Information

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IPC IPC(8): C01G51/00
Inventor 张伟左旭东吴承伟
Owner DALIAN UNIV OF TECH
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