“314型”氧空位有序SrCo $_{0.85}$ Fe $_{0.15}$ O $_{2.62}$的室温磁电阻和交换偏置
Room Temperature Magnetoresistance and Exchange Bias in "314 - type" Oxygen-Vacancy Ordered SrCo$_{0.85}$Fe$_{0.15}$O$_{2.62}$
摘要：
本文报道了SrCo $_{0.85}$ Fe $_{0.15}$ O $_{2.62}$“314型”氧空位有序材料的磁输运和交换偏置效应。该材料在室温以上（315 K）表现出亚铁磁转变。从室温开始出现负磁电阻（在295 K和70 kOe下为-1.3 $\%$），并在4 K和70 kOe下达到相当大的值58 $\%$。当样品在磁场存在下冷却时，在315 K以下观察到较大的交换偏置效应。层状结构中近补偿区和亚铁磁区的共存导致了样品的磁电阻和交换偏置。相当大的磁电阻和巨交换偏置效应的出现，特别是在室温附近，表明“314型”钴酸盐是一类有前途的材料系统，用于探索具有磁传感器或自旋电子学领域的潜在应用的材料。
英文摘要：
Herein, we report the magneto-transport and exchange bias effect in a "314 - type" oxygen - vacancy ordered material with composition SrCo$_{0.85}$Fe$_{0.15}$O$_{2.62}$. This material exhibits a ferrimagnetic transition above room temperature, at 315 K. The negative magnetoresistance starts to appear from room temperature (-1.3 $\%$ at 295 K in 70 kOe) and reaches a sizable value of 58 $\%$ at 4 K in 70 kOe. Large exchange bias effect is observed below 315 K when the sample is cooled in the presence of a magnetic field. The coexistence of nearly compensated and ferrimagnetic regions in the layered structure originate magnetoresistance and exchange bias in this sample. The appearance of a sizable magnetoresistance and giant exchange bias effect, especially near room temperature indicates that "314-type" cobaltates are a promising class of material systems for the exploration of materials with potential applications as magnetic sensors or in the area of spintronics.
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