arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.04531cond-mat.mes-hall
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交换耦合异质结构中Cr $_2$ O $_3$ -(0001)反铁磁薄膜Néel温度的有限尺寸标度效应

Finite-size scaling effect on Néel temperature of antiferromagnetic Cr$_2$O$_3$-(0001) films in an exchange-coupled heterostructure

Satya Prakash Pati, Muftah Al-Mahdawi, Shujun Ye, Yohei Shiokawa, Tomohiro Nozaki, Masashi Sahashi

摘要:

研究了刚玉型氧化铬薄膜反铁磁有序温度的标度。Néel温度$T_N$由垂直交换偏置对弱耦合相邻铁磁体磁化强度的影响确定。对于一个厚膜的情况下,检测的有效性确认的磁化率测量。$T_N$的检测可以低至1 nm的氧化铬薄膜。采用不同的缓冲材料研究了有序化温度随厚度的变化规律,并与蒙特卡罗模拟进行了比较。计算了自旋关联长度和相应的临界指数,实验结果与模拟结果吻合较好。自旋相关长度比立方反铁磁体小一个数量级。我们认为这种差异是由于两个晶体系统中交换耦合链数目的变化造成的。

英文摘要:

The scaling of antiferromagnetic ordering temperature of corundum-type chromia films have been investigated. Néel temperature $T_N$ was determined from the effect of perpendicular exchange-bias on the magnetization of a weakly-coupled adjacent ferromagnet. For a thick-film case, the validity of detection is confirmed by a susceptibility measurement. Detection of $T_N$ was possible down to 1-nm-thin chromia films. The scaling of ordering temperature with thickness was studied using different buffering materials, and compared with Monte-Carlo simulations. The spin-correlation length and the corresponding critical exponent were estimated, and they were consistent between experimental and simulation results. The spin-correlation length is an order of magnitude less than cubic antiferromagnets. We propose that the difference is from the change of number of exchange-coupling links in the two crystal systems.

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