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Concomitant interfacial spin fractal transformation and exchange bias in a magnetic shape memory alloy

Shen, L. LU ; Gong, Y. ; Alshemi, A. LU ; Campillo Munoz, Emma LU ; Cubitt, R. ; Steinke, N.-j. and Blackburn, E. LU (2023) In Applied Physics Letters 123(13).
Abstract
Small-angle neutron scattering is used to study the exchange bias effect in Mn50Ni40Sn10. The martensitic transformation is found to be responsible for the nanometer-scale spin clusters (SCs) inside the low-temperature ferromagnetic (FM) martensite phase. The magnetic field dependences of the SCs and FM domains exhibit an asymmetry that characterizes the exchange bias. We find that the surface geometries of the two magnetic phases are strongly susceptible to magnetization changes. While the FM domains and SCs are dominated by diffuse and fractal surfaces around the coercive fields, this configuration is reversed in the saturation regime, where the FM and SC surfaces become fractal and diffuse, respectively. These geometry changes are... (More)
Small-angle neutron scattering is used to study the exchange bias effect in Mn50Ni40Sn10. The martensitic transformation is found to be responsible for the nanometer-scale spin clusters (SCs) inside the low-temperature ferromagnetic (FM) martensite phase. The magnetic field dependences of the SCs and FM domains exhibit an asymmetry that characterizes the exchange bias. We find that the surface geometries of the two magnetic phases are strongly susceptible to magnetization changes. While the FM domains and SCs are dominated by diffuse and fractal surfaces around the coercive fields, this configuration is reversed in the saturation regime, where the FM and SC surfaces become fractal and diffuse, respectively. These geometry changes are driven by the spin reorientation inside the heterogeneous FM/SC domain walls, where exchange anisotropy arises. Our work reveals the microscopic mechanism underlying the exchange bias effect in magnetic shape memory alloys. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
123
issue
13
article number
132402
publisher
American Institute of Physics (AIP)
external identifiers
  • scopus:85173046882
ISSN
0003-6951
DOI
10.1063/5.0166232
project
Accessing high pressure and low temperature states of exotic magnetism
language
English
LU publication?
yes
id
c5709f0d-72b1-466a-a434-b66e0d7f6171
date added to LUP
2023-10-18 17:52:17
date last changed
2023-11-21 23:35:14
@article{c5709f0d-72b1-466a-a434-b66e0d7f6171,
  abstract     = {{Small-angle neutron scattering is used to study the exchange bias effect in Mn50Ni40Sn10. The martensitic transformation is found to be responsible for the nanometer-scale spin clusters (SCs) inside the low-temperature ferromagnetic (FM) martensite phase. The magnetic field dependences of the SCs and FM domains exhibit an asymmetry that characterizes the exchange bias. We find that the surface geometries of the two magnetic phases are strongly susceptible to magnetization changes. While the FM domains and SCs are dominated by diffuse and fractal surfaces around the coercive fields, this configuration is reversed in the saturation regime, where the FM and SC surfaces become fractal and diffuse, respectively. These geometry changes are driven by the spin reorientation inside the heterogeneous FM/SC domain walls, where exchange anisotropy arises. Our work reveals the microscopic mechanism underlying the exchange bias effect in magnetic shape memory alloys.}},
  author       = {{Shen, L. and Gong, Y. and Alshemi, A. and Campillo Munoz, Emma and Cubitt, R. and Steinke, N.-j. and Blackburn, E.}},
  issn         = {{0003-6951}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{13}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Applied Physics Letters}},
  title        = {{Concomitant interfacial spin fractal transformation and exchange bias in a magnetic shape memory alloy}},
  url          = {{http://dx.doi.org/10.1063/5.0166232}},
  doi          = {{10.1063/5.0166232}},
  volume       = {{123}},
  year         = {{2023}},
}