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  • Amorphous magnetic semiconductors with Curie temperatures above room temperature

    Na Chen, Kaixuan Fang, Hongxia Zhang, Yingqi Zhang, Wenjian Liu, Kefu Yao, Zhengjun Zhang

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    Abstract Full Text PDF

    Recently, amorphous magnetic semiconductors as a new family of magnetic semiconductors have been developed by oxidizing ferromagnetic metals/alloys. Starting from high Curie-temperature ferromagnets, these amorphous magnetic semiconductors show Curie temperatures well above room temperature. Among them, one typical example is a p-type Co28.6Fe12.4Ta4.3B8.7O46 magnetic semiconductor, which has an optical bandgap of ~2.4 eV, room-temperature saturation magnetization of ~480 emu/cm3, and the Curie temperature above 600 K. The amorphous Co28.6Fe12.4Ta4.3B8.7O46 magnetic semiconductor can be integrated with n-type Si to form p-n heterojunctions with a threshold voltage of ~1.6 V, validating its p-type semiconducting character. Furthermore, the demonstration of electric field control of its room-temperature ferromagnetism reflects the interplay between the electricity and ferromagnetism in this material. Intriguingly, tuning the relative atomic ratios of Co and Fe in the Co–Fe–Ta–B–O system leads to the formation of an intrinsic magnetic semiconductor. It is suggested that the carrier density, ferromagnetism and conduction type of an intrinsic magnetic semiconductor are controllable by means of an electric field effect. These findings may pave a new way to realize magnetic semiconductor-based spintronic devices that work at room temperature.

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