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Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films

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Abstract

In this paper, (001) textured FeRh/FePt bilayer thin film was fabricated by sputtering and the temperature-dependent magnetic behavior of FePt/FeRh bilayers was investigated in detail. The magnetic regime passes from exchange bias to exchange spring when the temperature increases from low to high, resulting from the first-order antiferromagnetic (AFM) to ferromagnetic (FM) phase transition in ordered FeRh alloy layer. Controlling the temperature-allowed modification of the hysteresis loops of exchange-spring-like FeRh/FePt bilayer due to the nanoscale soft/hard interface exchange coupling, our experimental results clearly show that the coercive field decreases strongly at the temperature where FeRh completely transforms to ferromagnetic state. In an exchange-spring-like FeRh/FePt bilayer film, the out-of-plane magnetization reversal process was in two steps and resulted from domain wall nucleation and propagation from the FeRh layer into the FePt layer.

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Acknowledgements

The present work was supported by National Natural Science Foundation of China (Grant No. 50901052), Program for Young Excellent Talents in Tongji University (Grant No. 2009KJ003) and “Chen Guang” Project (Grant No. 10CG21) supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Key Lab of D&A for Metal-Functional Materials, Tongji University, Shanghai, 200092, China

    Wei Lu, Chenchong He, Zhe Chen, Junwei Fan & Biao Yan

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  1. Wei Lu
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  2. Chenchong He
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  3. Zhe Chen
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  4. Junwei Fan
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  5. Biao Yan
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Correspondence to Wei Lu.

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Lu, W., He, C., Chen, Z. et al. Magnetic properties of epitaxial-grown exchange-coupled FePt/FeRh bilayer films. Appl. Phys. A 108, 149–153 (2012). https://doi.org/10.1007/s00339-012-6862-1

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