Magnetic Properties of Amorphous Fe2O3-R2O3 (R=La, Gd and Tb) Thin Films Fabricated by Sputtering Method
Magnetic Properties of Amorphous Fe2O3-R2O3 (R=La, Gd and Tb) Thin Films Fabricated by Sputtering Method
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DOI：
10.4028/www.scientific.net/amr.39-40.207
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
H. Akamatsu;S. Murai;K. Fujita;Katsuhisa Tanaka
中科院分区：
文献类型：
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作者：
H. Akamatsu;S. Murai;K. Fujita;Katsuhisa Tanaka
采用射频溅射法制备了Fe2O3-R2O3 （R = La， Gd和Tb）体系的非晶氧化薄膜，并对薄膜的磁性能进行了测试。Fe2O3-La2O3薄膜的直流磁化率在温度依赖性上表现出尖状最大值，并具有典型自旋玻璃的磁老化和记忆效应。对于Fe2O3-Gd2O3和Fe2O3-Tb2O3体系，铁离子的磁矩参与了自旋玻璃态的形成，表现为磁时效效应，而稀土离子的磁矩即使在极低温度下也保持顺磁态。
Amorphous oxide thin films of Fe2O3-R2O3 (R = La, Gd and Tb) systems have been deposited on silica glass substrates by using a radio frequency sputtering method, and magnetic properties of the thin films have been examined. The Fe2O3-La2O3 thin films exhibit cusp-like maxima of dc magnetic susceptibility in their temperature dependences as well as magnetic aging and memory effects characteristic of typical spin glasses. For Fe2O3-Gd2O3 and Fe2O3-Tb2O3 systems, magnetic moments of iron ions take part in formation of a spin glass state, as indicated by the magnetic aging effects, while those of rare-earth ions remain to be in a paramagnetic state even at very low temperatures.