A kind of sn-doped cro2 thin film and preparation method thereof

Abstract

The invention specifically relates to a Sn-doped CrO2 thin film and a preparation method thereof. The technical solution is: first put 75~99.99 parts of CrO3 into the quartz boat, put 0.01~25 parts of SnCl2 into another quartz boat, and then put the above two quartz boats into the dual temperature zone tube type In the low-temperature zone of the furnace, put the TiO2 single crystal substrate into the high-temperature zone of the dual-temperature zone tube furnace; under the condition of continuous feeding of O2, first heat the high-temperature zone to 360°C~420°C, start to keep warm, and keep warm in the high-temperature zone The end time of the heat preservation in the low temperature area is the same as the end time of the heat preservation in the low temperature area; when the heat preservation is started in the high temperature area, the low temperature area is heated to 240 ° C ~ 300 ° C and kept for 2 ~ 8 hours; natural cooling, that is, Sn doped CrO2 is prepared on the single crystal substrate film. The invention has the characteristics of simple operation and rapid industrial production. The Sn-doped CrO2 thin film prepared by the method has greatly improved thermal stability under the condition of no large change in magnetic properties, and has a wide range of applications.

Description

technical field [0001] The present invention belongs to CrO 2 The field of thin film technology. Specifically related to a Sn-doped CrO 2 Thin films and methods for their preparation. Background technique [0002] In recent years, spintronics has become one of the focuses of international condensed matter physics and materials science, and has attracted extensive attention. As the simplest ferromagnetic semi-metal oxide CrO2 is the traditional magnetic recording material, CrO 2 It has been proved by experiments that the spin polarizability is close to 100%, and the Curie temperature of CrO2 is as high as 396K. Therefore, CrO2 is considered to be one of the electrode materials with great development potential and ideal spintronic devices. [0003] CrO 2 It is a metastable oxide at normal temperature and pressure, which leads to the preparation of CrO 2 Very difficult. The currently published preparation of CrO 2 The method is to decompose CrO under the condition of h...

AI Technical Summary

Problems solved by technology

This method is not only cumbersome, but also carried out in an aqueous environment, and a modifier is added, resulting in the presence of impurities in the product and low magnetization

[0004]CrO2 Although it is a magnetic material with good magnetic properties and wide application, it is in a metastable state at room temperature and has poor thermal stability

Pure CrO 2 It begins to decompose into Cr above 400°C 2 o 3 , which greatly limits its scope of application

The currently disclosed methods are only how to prepare high-purity CrO2 materials, and there is no specific preparation method for doping Sn elements into CrO2 materials to improve their thermal stability.