Temperature dependence of current-induced magnetization switching in spin valves with a ferrimagnetic CoGd free layer |
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Authors: | Jiang Xin Gao Li Sun Jonathan Z Parkin Stuart S P |
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Institution: | IBM Almaden Research Center, San Jose, California 95120, USA. |
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Abstract: | The temperature dependence of current-induced magnetization switching of ferrimagnetic CoGd free layers in spin valves is explored. At temperatures well above and well below the magnetization compensation temperature (T(MC)) of CoGd, a current flowing from the free layer to the CoFe fixed layer aligns the moments of the two layers parallel, and a current flowing in the opposite direction aligns them antiparallel. However, for intermediate temperatures just above T(MC), the current-induced alignment of the moments is reversed. We attribute this effect to the different compensation temperatures of the net magnetization and angular momentum of CoGd. |
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