Origin of ferromagnetism in Zn 1-x Co x O from magnetization and spin-dependent magnetoresistance measurements
Origin of ferromagnetism in Zn 1-x Co x O from magnetization and spin-dependent magnetoresistance measurements
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DOI：
10.1103/physrevb.76.155312
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发表时间：
2007-08
影响因子：
3.7
通讯作者：
T. Dietl;T. Andrearczyk;A. Lipi'nska;M. Kiecana;M. Tay;M. Tay;Yihong Wu
中科院分区：
文献类型：
--
作者：
T. Dietl;T. Andrearczyk;A. Lipi'nska;M. Kiecana;M. Tay;M. Tay;Yihong Wu
为了阐明在（Zn,Co）O中观察到的铁磁特征的性质，我们从实验和理论上研究了控制低温磁电阻的磁性和自旋相关的量子局域化效应。我们的研究结果，连同一个完整的结构表征，证实了富钴纤锌矿（Zn,Co）O反铁磁纳米晶体表面（Zn,Co）O的自发磁化与无补偿自旋的模型。该模型解释了在纤锌矿晶格的晶体场中Co离子的自旋哈密顿量在磁化和磁阻方面观察到的大的各向异性。
In order to elucidate the nature of ferromagnetic signatures observed in (Zn,Co)O, we have examined experimentally and theoretically magnetic properties and spin-dependent quantum localization effects that control low-temperature magnetoresistance. Our findings, together with a through structural characterization, substantiate the model assigning spontaneous magnetization of (Zn,Co)O to uncompensated spins at the surface of antiferromagnetic nanocrystal of Co-rich wurtzite (Zn,Co)O. The model explains a large anisotropy observed in both magnetization and magnetoresistance in terms of spin Hamiltonian of Co ions in the crystal field of the wurtzite lattice.