Method for preparing ferromagnetic single-crystal film with ultra-large vertical coercivity

Abstract

The invention relates to a method for preparing a ferromagnetic single-crystal film with ultra-large vertical coercivity, comprising the following steps: (1) putting a substrate into a molecular-beam epitaxy equipment sample bracket; (2) increasing the temperature of the substrate to a predetermined temperature, and preserving the temperature for a predetermined time; (3) decreasing the temperature of the substrate to a predetermined temperature, and growing a buffer layer on the substrate by adopting the molecular-beam epitaxy technology; and (4) cooling the substrate to a predetermined temperature, and growing a ferromagnetic thin film layer on the substrate by adopting the molecular-beam epitaxy technology. The ferromagnetic single-crystal film prepared by adopting the method has ultra-large vertical coercivity, ultra-high perpendicular magnetic anisotropy and ultra-high magnetic energy product, is prepared in simple processes, is easy to integrate and does not contain precious metals and rare earth elements.

Description

technical field [0001] The invention relates to the technical fields of ultra-high-density magneto-optical storage, magnetic storage, high-sensitivity magnetic sensors, high-performance permanent magnets, etc., in particular to a preparation method of a ferromagnetic single-crystal thin film with super large vertical coercive force. Background technique [0002] In recent years, with the rapid development of information technology, the requirements for information storage density and storage speed have been increasing. In order to further increase the recording density of magneto-optical disks, magnetic disks, etc., the size of the magnetic unit in the recording medium must be reduced to less than 10nm, and at such a small size, the traditional horizontal recording mode has encountered an insurmountable limit - due to thermal disturbances. superparamagnetic effect. To overcome this limit, a perpendicular recording mode based on new materials with high perpendicular magnetic...

AI Technical Summary

Problems solved by technology

Up to now, there is no report of a perpendicular easily magnetizable material that can simultaneously possess a ferromagnetic thin film with super large coercive force, super high perpendicular magnetic anisotropy and super high magnetic energy product, compatible with the current very mature semiconductor process, easy to integrate, It does not contain precious metals or rare earth elements, etc.

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