Rare earth oxide ceramic material with exchange bias reversal and preparation method of rare earth oxide ceramic material

Abstract

The invention belongs to the field of rare earth magnetic functional materials and particularly relates to a rare earth oxide ceramic material with exchange bias reversal and a preparation method of the rare earth oxide ceramic material. The molecular formula of the rare earth oxide ceramic material is YbCr0.9Fe0.1O3. The preparation method of the rare earth oxide ceramic material comprises the following steps: uniformly mixing a powdery ytterbium source compound, a chromium source compound and an iron source compound according to the percentage of metal atoms; compacting the uniformly-mixed powder; carrying out pre-sintering and high temperature solid phase sintering on the obtained compact, and then cooling; detecting the single-phase property of the obtained product by X-ray diffraction, and carrying out sufficient solid-phase reaction to form a perovskite type Yb(Cr.Fe)O3 single phase, namely a target product YbCr0.9Fe0.1O3. According to the preparation method disclosed by the invention, the exchange bias reversal temperature and the exchange bias cut-off temperature are respectively improved to 31K and 130 K, the temperature range of the exchange bias effect is widened, and the exchange bias reversal temperature is increased, therefore, a new step is stepped for practical application.

Description

technical field [0001] The invention belongs to the field of rare earth magnetic functional materials, in particular to a rare earth oxide ceramic material with exchange bias reversal and a preparation method thereof. Background technique [0002] The exchange bias effect has attracted the attention of many scientists and technicians worldwide because of its important applications in the fields of magnetic recording, spin valve devices and sensors. The phenomenon of exchange bias was first discovered in 1956 by Meiklejohn and Bean in cobalt-cobalt oxide micropowders with core-shell structure. Exchange bias is generally defined as the phenomenon that the hysteresis loop shifts along the H-axis when the system is cooled from the Neel temperature higher than the antiferromagnetic material to a lower temperature in a static magnetic field. This phenomenon usually occurs in heterostructure systems with ferromagnetism and antiferromagnetism. For example, exchange bias is found in...

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Problems solved by technology

For example in La 1-x PR x CrO 3 、Sr 2 wxya 6 , NdMnO 3 , YbFe 2 o 4 , TmCrO 3 The exchange bias effect has been found in compounds such as , but it is still rare to find compounds with positive exchange bias effect or exchange bias reversal

In 2016, L.Wang et al published a paper entitled "Reversals of magnetization and exchange-bias inperovskite chromite YbCrO 3 " article, reported the single-phase compound YbCrO 3 exchange bias reversal and magnetization reversal in YbCrO 3 The exchange bias inversion temperature and the exchange bias cut-off temperature are only 19K and 105K respectively, which is not easy for practical application

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