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Electron Holography Studies on Narrow Magnetic Domain Walls Observed in a Heusler Alloy Ni50Mn25Al12.5Ga12.5

Authors

  • Hyun Soon Park,

    Corresponding author
    1. Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan
    • Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan.
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  • Yasukazu Murakami,

    1. Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan
    2. Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai, Miyagi 980-8577, Japan
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  • Keiichi Yanagisawa,

    1. Okinawa Institute of Science and Technology Graduate University Onna-son, Okinawa 904-0495, Japan
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  • Tsuyoshi Matsuda,

    1. Japan Science and Technology Agency Kawaguchi-shi, Saitama 332-0012, Japan
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  • Ryosuke Kainuma,

    1. Department of Materials Science Graduate School of Engineering Tohoku University, Sendai, Miyagi 980-8579, Japan
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  • Daisuke Shindo,

    1. Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan
    2. Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai, Miyagi 980-8577, Japan
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  • Akira Tonomura

    1. Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan
    2. Okinawa Institute of Science and Technology Graduate University Onna-son, Okinawa 904-0495, Japan
    3. Central Research Laboratory Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan
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Abstract

Peculiar magnetic domain walls produced in Heusler alloys, which have attracted renewed interest due to their potential application to actuators and spintronic devices, are studied here using electron holography. The observations reveal unexpectedly narrow magnetic domain walls, the width of which showed perfect agreement with that of the antiphase boundaries (APB, e.g., only 3 nm). While the results can be explained by the significant depression of ferromagnetism due to the local chemical disorder, the electron phase shift indicates that ferromagnetic correlation still remains in the APB region.

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