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The Observation of Martensite and Magnetic Domain Structures in Ni53Mn24Ga23 Shape Memory Alloys by Scanning Electron Acoustic Microscopy and Scanning Thermal Microscopy |
| ZHAO Kun-Yu1,ZENG Hua-Rong1**,SONG Hong-Zhang2,HUI Sen-Xing1,LI Guo-Rong1,YIN Qing-Rui1 |
1Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050
2School of Physical Engineering and Material Physics Laboratory, Zhengzhou University, Zhengzhou 450052 |
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ZHAO Kun-Yu, ZENG Hua-Rong**, SONG Hong-Zhang et al 2012 Chin. Phys. Lett. 29 050702 |
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Abstract We present observations of martensite variants and ferromagnetic domain structures of Ni53Mn24Ga23 ferromagnetic shape memory alloys with a pure tetragonal martensitic phase by using scanning electron acoustic microscopy (SEAM) and scanning thermal microscopy (SThM). Electron acoustic images show a polycrystalline morphology with martensite variants. Direct coincidence between crystallographic martensitic twin variants and magnetic domains is found. A domain-like structure, obtained by SThM, is firstly reported, and then confirmed by magnetic force microscopy (MFM). The experimental results will be helpful for investigating the local thermal properties of ferromagnets and understanding the relationship between martensite variants and magnetic domains.
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Received: 09 January 2012
Published: 30 April 2012
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07.79.Lh
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(Atomic force microscopes)
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07.79.Pk
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(Magnetic force microscopes)
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61.46.-w
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(Structure of nanoscale materials)
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