Magnetic Properties of Amorphous Spin Glass Gd_<22>Y_<46>Cu_<32>
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概要
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We report on magnetic properties of an amorphous Gd_<22>Y_<46>Cu_<32> alloy. The magnetization was measured from 1.7K to 250K in the magnetic field up to 12T. The alloy obeys the Curie-Weiss law above about 80 K with the paramagnetic Curie temperature T_p=45.6 K. The Arrott plot shows that the system has no spontaneous magnetization even at 1.7K. The low field magnetization has the hysteresis on temperature in a field-cooled and zero-field-cooled process. These observations suggest that the system is a spin glass with the spin glass temperature T_g=14.2K. The high field magnetization follows the spin wave like T^<3/2> law below about 8 K. The spin wave stiffness constant thus obtained is D=2.8 meVÅ which is much smaller than that of an amorphous Gd_<22>Cu_<32> ferromagnet. We discuss the relation between D and T_p.
- 社団法人日本磁気学会の論文
- 1999-01-20
著者
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Nakai Ikuo
Department Of Electrical And Electonic Engineering Tottori University
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Nakai Ikuo
Department of Electrical and Electronic Engineering, Tottori University
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