Peculiar temperature dependence of magneto-optic Kerr rotation associated with antiferromagnetic-paramagnetic transition

被引:2
作者
Ekawa, Hirofumi [1 ]
Okano, Takashi [1 ]
Huang, Oujin [1 ]
Iino, Ion [1 ]
Toyoki, Kentaro [1 ,2 ,3 ]
Nakatani, Ryoichi [1 ,2 ,3 ]
Kato, Takeshi [4 ]
Shiratsuchi, Yu [1 ,2 ,3 ]
机构
[1] Osaka Univ, Grad Sch Engn, Dept Mat Sci & Engn, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Inst Open & Transdisciplinary Res Initiat, Spintronics Res Network Div, Suita, Osaka 5650871, Japan
[3] Osaka Univ, Grad Sch Engn Sci, Ctr Spintron Res Network, Toyonaka, Osaka 5608531, Japan
[4] Nagoya Univ, Inst Mat & Syst Sustainabil, Nagoya, Aichi 4648601, Japan
关键词
magneto-optic Kerr effect; antiferromagnet; neel temperature; INTERFERENCE; ENHANCEMENT; RESONANCE; SPECTRA;
D O I
10.35848/1347-4065/ac8b8e
中图分类号
O59 [应用物理学];
学科分类号
摘要
We investigate the magneto-optic Kerr effect in perpendicularly magnetized Pt/Co/Ir/Cr2O3/Pt thin films, associated with the antiferromagnetic-paramagnetic transition of the Cr2O3 layer. The magneto-optic Kerr rotation angle (theta (K)) shows oscillatory behavior as a function of the photon energy of incident light owing to interference in the Cr2O3 layer. The temperature dependence of theta (K) at 2.67 eV (lambda = 465 nm), at which the largest theta (K) is obtained, shows a sharp dip at 287.0 K. The dip temperature is similar to the reported Neel temperature for Cr2O3 thin films. Although the theta (K) spectra measured at several temperatures are generally explained by the classical interference model, theta (K) is enhanced at 2.36-2.79 eV (lambda = 525-445 nm) close to the dip temperature. This peculiar enhancement in theta (K) is discussed on the basis of the anomaly in the optical parameters of the Cr2O3 layer associated with the antiferromagnetic-paramagnetic transition.
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页数:6
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