Phase transformation in Ni-Mn-Sn ferromagnetic shape memory alloy thin films induced by dense ionization

被引：11
作者：
Vishnoi, R. [1 ,3 ]
Singhal, R. [2 ]
Asokan, K. [2 ]
Kanjilal, D. [2 ]
Kaur, D. [1 ,3 ]
机构：
[1] Indian Inst Technol, Dept Phys, Funct Nanomat Res Lab, Roorkee 247667, Uttar Pradesh, India
[2] Inter Univ Accelerator Ctr, New Delhi 110067, India
[3] Indian Inst Technol, Ctr Nanotechnol, Roorkee 247667, Uttar Pradesh, India
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2012年 / 107卷 / 04期
关键词：
MICROSTRUCTURAL MODIFICATIONS; MARTENSITIC TRANSFORMATIONS; TI-NI; TITANIUM; TRACKS; CU;
D O I：
10.1007/s00339-012-6826-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of 200 MeV Au ions irradiation on the structural and magnetic properties of Ni-Mn-Sn ferromagnetic shape memory alloy (FSMA) thin films have been systematically investigated. In order to understand the role of initial microstructure and phase of the film with respect to high energy irradiation, the two types of Ni-Mn-Sn FSMA films having different phases at room temperature were irradiated, one in martensite phase (Ni58.9Mn28.0Sn13.1) and other in austenite phase (Ni50Mn35.6Sn14.4). Transmission electron microscope (TEM) and scanning electron microscope (SEM) images along with the diffraction patterns of X-rays and electrons confirm that martensite phase transforms to austenite phase at a fluence of 6x10(12) ions/cm(2) and a complete amorphization occurs at a fluence of 3x10(13) ions/cm(2), whereas ion irradiation has a minimal effect on the austenitic structure (Ni50Mn35.6Sn14.4). Thermo-magnetic measurements also support the above mentioned behaviour of Ni-Mn-Sn FSMA films with increasing fluence of 200 MeV Au ions. The results are explained on the basis of thermal spike model considering the core and halo regions of ion tracks in FSMA materials.
引用
收藏
页码：925 / 934
页数：10
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