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Paper Titles
Stress-Temperature Phase Diagram of Ni2MnGa and Structural Relations between its Constituent Phases
p.61
Neutron Diffraction Studies of Magnetic Shape Memory Alloys
p.73
Influence of Long-Range Atomic Order on the Structural and Magnetic Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys
p.85
Crystal Structures of Modulated Martensitic Phases of FSM Heusler Alloys
p.105
Magnetic Microstructure Analysis of Ferromagnetic Shape Memory Alloys and Related Compounds
p.117
Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators
p.129
Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys
p.139
Reverse Magnetostructural Transitions by Co and In Doping NiMnGa Alloys: Structural, Magnetic, and Magnetoelastic Properties
p.151
Magnetic Phase Diagram of the Ferromagnetic Shape Memory Alloys Ni2MnGa1-xCux
p.165

Magnetic Microstructure Analysis of Ferromagnetic Shape Memory Alloys and Related Compounds

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Abstract:

We performed magnetic imaging of Ni-based ferromagnetic shape memory alloys. The magnetic microstructure was revealed by Lorentz microscopy and electron holography, which are powerful tools based on transmission electron microscopy. Observations of Ni51Fe22Ga27 and Ni50Mn25Al12.5Ga12.5 alloys, both of which have an L21-ordered structure in the parent phase, demonstrated that the antiphase boundaries (i.e., a type of planer defects) caused significant changes in the magnetization distribution due to depression of the atomic order—actually, the magnetization in these alloys depends upon the degree of chemical order. We propose a method which estimates the important magnetic parameters (the magnetocrystalline anisotropy constant and exchange stiffness constant) based on transmission electron microscopy observations. This method should be useful in magnetic measurements of nanometer-scale areas, for which conventional techniques cannot be applied.

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Periodical:

Materials Science Forum (Volume 684)

Pages:

117-128

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.684.117

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Online since:

May 2011

Authors:

Y. Murakami, Ryosuke Kainuma, Daisuke Shindo, Akira Tonomura

Keywords:

Antiphase Boundary (APB), Domain Wall, Electron Holography, Lorentz Microscopy, Magnetic Domain, Martensite, TEM

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