Exchange Anisotropy and Strain Interactions in the Ni‐NiO System
作者:
A. E. Berkowitz,
J. H. Greiner,
期刊:
Journal of Applied Physics
(AIP Available online 1965)
卷期:
Volume 36,
issue 10
页码: 3330-3341
ISSN:0021-8979
年代: 1965
DOI:10.1063/1.1702976
出版商: AIP
数据来源: AIP
摘要:
The interactions between Ni and NiO were investigated by examining the magnetic properties of Ni films on single‐crystal NiO substrates. The orientations of the NiO substrates were (001) (compensated spin planes), and (111) (parallel spin planes). With (001) NiO the Ni films were strained an amount corresponding approximately to the rhombohedral deformation of NiO below its Ne´el temperature. The amplitude and symmetry of magnetic torque data were consistent with the magnitude of this strain and the symmetry of the antiferromagnetic domain structure, respectively. Ni films on (111) NiO substrates had a complex field dependence of rotational hysteresis. This behavior was analyzed in terms of exchange anisotropy coupling and the interaction of the field with both the Ni and NiO spin systems. The analysis provided good agreement with the data for an exchange anisotropy energy of 1.75 erg/cm2of interface, a crystalline anisotropy of NiO in its parallel spin plane of 1.1×103erg/cc NiO, and a ``flop field'' for NiO in its parallel spin plane of 5 to 10 kOe. The analysis showed that two new regions of rotational hysteresis loss are present in fields ≥ the ``flop field'' of the antiferromagnetic spin system. Some more general features of exchange anisotropy coupling are also discussed.
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