Magnetic anisotropy, sress, and martensitic transformation in Ni-Mn-Ga thin films on Si(100) wafer

Michael Hagler, Volodymyr A. Chernenko, Makoto Ohtsuka, Stefano Besseghini, Peter Milliner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Ni-Mn-Ga magnetic shape memory alloys (MSMAs) tend to undergo a large deformation upon the application of a magnetic field. This deformation is attributed to twin boundary motion in the martensitic phase. In an effort to harness the shape memory effect for use in sensors, actuators, and micro-devices, the behavior of Ni-Mn-Ga thin films is attracting attention. Substrate curvature measurements were done with Ni-Mn-Ga films with a thickness of 2.0 urn sputter-deposited on Si(100) wafer having amorphous 500 nm thick SiNx buffer layer. During the wafer bow curvature measurements, stress levels of 0.65 GPa were attained. The martensitic transformation is manifested by a stress-temperature hysteretic loop. Measurements of magnetization curves were carried out on Ni-Mn-Ga films with thickness between 0.5 and 3.0 nm. A change of the magnetization behavior from the easy-plane type for thin films to the out-of-plane easy-axis type for thick films is observed. This effect is caused by the interplay between different contributions to the overall anisotropy of film.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings - Nanoscale Magnetics and Device Applications
PublisherMaterials Research Society
Pages109-114
Number of pages6
ISBN (Print)9781605604312
DOIs
Publication statusPublished - 2007 Jan 1
EventNanoscale Magnetics and Device Applications - 2007 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2007 Apr 92007 Apr 13

Publication series

NameMaterials Research Society Symposium Proceedings
Volume998
ISSN (Print)0272-9172

Other

OtherNanoscale Magnetics and Device Applications - 2007 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period07/4/907/4/13

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Hagler, M., Chernenko, V. A., Ohtsuka, M., Besseghini, S., & Milliner, P. (2007). Magnetic anisotropy, sress, and martensitic transformation in Ni-Mn-Ga thin films on Si(100) wafer. In Materials Research Society Symposium Proceedings - Nanoscale Magnetics and Device Applications (pp. 109-114). (Materials Research Society Symposium Proceedings; Vol. 998). Materials Research Society. https://doi.org/10.1557/proc-998-j06-09