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Fundamental Investigation of Ferromagnetic Shape Memory Alloys: A New Perspective

Published online by Cambridge University Press:  01 February 2011

Matthew R. Sullivan ,
Daniel A. Ateya ,
Steven Pirotta ,
Ashish A. Shah ,
G. H. Wu  and
Harsh Deep Chopra
Matthew R. Sullivan
Affiliation:
Thin Films & Nanosynthesis Laboratory, Materials Program, Mechanical and Aerospace Engineering Department, State University of New York at Buffalo, Buffalo, NY, USA
Daniel A. Ateya
Affiliation:
Thin Films & Nanosynthesis Laboratory, Materials Program, Mechanical and Aerospace Engineering Department, State University of New York at Buffalo, Buffalo, NY, USA
Steven Pirotta
Affiliation:
Thin Films & Nanosynthesis Laboratory, Materials Program, Mechanical and Aerospace Engineering Department, State University of New York at Buffalo, Buffalo, NY, USA
Ashish A. Shah
Affiliation:
Thin Films & Nanosynthesis Laboratory, Materials Program, Mechanical and Aerospace Engineering Department, State University of New York at Buffalo, Buffalo, NY, USA
G. H. Wu
Affiliation:
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Harsh Deep Chopra*
Affiliation:
Thin Films & Nanosynthesis Laboratory, Materials Program, Mechanical and Aerospace Engineering Department, State University of New York at Buffalo, Buffalo, NY, USA
*
* Corresponding Author. E-Mail: hchopra@eng.buffalo.edu
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Abstract

In the present study, the evolution of micromagnetic structure and microstructure is studied in-situ both as a function of temperature and applied magnetic field, using single crystal Fe-Pd and Ni-Mn-Ga Heusler alloys. Through the development of a novel technique called ‘Magnetic Transition Spectrum’ to study temperature dependent domain dynamics, the relative sequence of micromagnetic reconfiguration with respect to the martensitic transformation has been determined for the first time. Results show that the FSMAs may be viewed as magnetic mosaics, a new perspective, which is also more amenable to modeling the physical properties of these alloys. Finally, the concept of magnetic mosaics has been used to synthesize a novel class of materials with engineered magnetic anisotropies, and is briefly discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D13.2
Copyright
Copyright © Materials Research Society 2004

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References

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