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

  1. Hyun Soon Park1,*,
  2. Yasukazu Murakami1,2,
  3. Keiichi Yanagisawa3,
  4. Tsuyoshi Matsuda4,
  5. Ryosuke Kainuma5,
  6. Daisuke Shindo1,2,
  7. Akira Tonomura1,3,6

Article first published online: 8 MAY 2012

DOI: 10.1002/adfm.201103052

Issue

Advanced Functional Materials

Advanced Functional Materials

Volume 22, Issue 16, pages 3434–3437, August 21, 2012

Additional Information

How to Cite

Park, H. S., Murakami, Y., Yanagisawa, K., Matsuda, T., Kainuma, R., Shindo, D. and Tonomura, A. (2012), Electron Holography Studies on Narrow Magnetic Domain Walls Observed in a Heusler Alloy Ni50Mn25Al12.5Ga12.5. Adv. Funct. Mater., 22: 3434–3437. doi: 10.1002/adfm.201103052

Author Information

  1. 1

    Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan

  2. 2

    Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai, Miyagi 980-8577, Japan

  3. 3

    Okinawa Institute of Science and Technology Graduate University Onna-son, Okinawa 904-0495, Japan

  4. 4

    Japan Science and Technology Agency Kawaguchi-shi, Saitama 332-0012, Japan

  5. 5

    Department of Materials Science Graduate School of Engineering Tohoku University, Sendai, Miyagi 980-8579, Japan

  6. 6

    Central Research Laboratory Hitachi, Ltd., Hatoyama, Saitama 350-0395, Japan

*Advanced Science Institute RIKEN, Wako, Saitama 351-0198, Japan.

Publication History

  1. Issue published online: 15 AUG 2012
  2. Article first published online: 8 MAY 2012
  3. Manuscript Received: 16 DEC 2011

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Keywords:

  • magnetic materials;
  • actuators;
  • holography;
  • alloys;
  • shape-memory materials

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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