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Easy axis oriented FePt, CoPt vertical magnetic recording thin film preparing method

A perpendicular magnetic recording and thin-film technology, which is applied in the field of material preparation, can solve problems such as poor magnetic properties, and achieve the effects of easy control of the process, ensuring the smoothness of the film surface, and saving costs

Inactive Publication Date: 2006-10-11
CAPITAL NORMAL UNIVERSITY
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Problems solved by technology

Kang (Shishou Kang, Appl.Phys.Lett., 86(2005) 062503-1) attempted to directly synthesize FePt particles with a face-centered tetragonal (fct) structure, and after dispersion, they were oriented in a magnetic field to obtain an easy axis perpendicular to the film surface. FePt thin film, but his work shows that at present, only some FePt particles with fct structure can be directly synthesized, and some particles are still with face-centered cubic (fcc) structure, so only some of the obtained FePt thin films have easy axes perpendicular to the film surface , so the hard magnetic

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  • Easy axis oriented FePt, CoPt vertical magnetic recording thin film preparing method
  • Easy axis oriented FePt, CoPt vertical magnetic recording thin film preparing method

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Embodiment Construction

[0015] The following examples are intended to further illustrate the process characteristics of the present invention rather than limit the present invention.

[0016] Preparation of Fe by chemical self-assembly 52 Pt 48 Particles, with an average diameter of 4 nm, were dispersed in hexane and then coated with glass as a substrate. Put the coated glass sheet into a magnetic field, the direction of the magnetic field is perpendicular to the glass surface, and the magnetic field strength is 2T. After the film was dried, the film was subjected to laser heat treatment with a YAG laser with a scanning speed of 1 mm / sec, a pulse current of 16 A, and a repetition frequency of 1 KHz.

[0017] figure 1 as prepared Fe 52 Pt 48 The magnetization and demagnetization curves of thin films, from figure 1 It can be seen that the coercivity of the magnet is very low, indicating that Fe 52 Pt 48 The particles have a face-centered cubic structure, and the magnets exhibit soft magnetic be...

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Abstract

The invention relates to a method for preparing the FePt, CoPt vertical magnetic record film, wherein said method comprises: (1) preparing FePt (M) or CoPt (M) film whose crystal is cubic, while M is one of C, P, B non-metal elements or one of Ag, Cu, Sn, Pb, Bi, Ga, and In whose fusion point is lower than Fe; (2) arranging FePt (M) or CoPt (M) film into magnetic film whose direction is vertical to the film; then processing laser thermal treatment on the film. The invention can make magnetic axle of iron magnetic crystal of film be arranged vertically to the film. And it ahs simple process and easy control, while it can confirm the film fineness.

Description

Background technique [0001] The invention relates to a preparation method of FePt and CoPt series perpendicular magnetic recording films with easy axis orientation, in particular to a method for preparing perpendicular magnetic recording media with FePt and CoPt series easy axes perpendicular to the film surface by combining laser rapid heat treatment and magnetic field treatment , which belongs to the technical field of material preparation. Background technique [0002] Since 1956, IBM has produced a storage capacity of 5MB and a recording density of 2Kbit / in 2 Since the first hard disk drive, the number of bytes recorded per unit of magnetic recording material has grown at a rate of 20M per year, and the growth rate has reached 40M in recent years. In 2004, the recording density of magnetic recording media has reached 200Gbit / in 2 . At present, scientists are developing recording density up to T bit / in 2 A new generation of magnetic recording materials. As a future h...

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Application Information

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IPC IPC(8): G11B5/84G11B5/852H01F10/14H01F10/16H01F41/22
Inventor 贺淑莉刘丽丽彭印王一红
Owner CAPITAL NORMAL UNIVERSITY
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