TY - JOUR
T1 - Soft X-ray absorption spectroscopy and magnetic circular dichroism under pulsed high magnetic field of Ni-Co-Mn-In metamagnetic shape memory alloy
AU - Umetsu, R. Y.
AU - Yasumura, H.
AU - Narumi, Y.
AU - Kotani, Y.
AU - Nakamura, T.
AU - Nojiri, H.
AU - Kainuma, R.
N1 - Funding Information:
We thank K. Kindo for his technical support in the installation of the pulse magnet. This study was supported by Grant-in-Aids from the Japanese Society for the Promotion of Science ( JSPS ), Ministry of Education, Culture, Sports, Science and Technology ( MEXT ), Japan. The synchrotron radiation experiments were conducted at BL25SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute ( JASRI ) (Proposal No. 2015B1345 ). Partial fundamental measurements were carried out at the High Field Laboratory for Superconducting Materials and the Center for Low Temperature Science Institute for Materials Research, Tohoku University.
Funding Information:
We thank K. Kindo for his technical support in the installation of the pulse magnet. This study was supported by Grant-in-Aids from the Japanese Society for the Promotion of Science (JSPS), Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The synchrotron radiation experiments were conducted at BL25SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2015B1345). Partial fundamental measurements were carried out at the High Field Laboratory for Superconducting Materials and the Center for Low Temperature Science Institute for Materials Research, Tohoku University.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/15
Y1 - 2022/1/15
N2 - In this study, X-ray absorption spectroscopy (XAS) experiments for Ni45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under high magnetic fields up to 12 T using a pulsed magnet. Field–induced reverse transformation from martensite phase to austenite phase caused considerable changes in the magnetic circular dichroism (MCD) signals and the magnetic moments of the Mn, Ni, and Co with ferromagnetic coupling were determined. The spin magnetic moment, Mspin, and orbital magnetic moment, Morb, of Mn atom in the induced austenite ferromagnetic phase, estimated based on the sum-rule analysis, were 3.19 and 0.08 μB, respectively, resulting in an Morb / Mspin ratio of 0.03. In the element-specific magnetization curves obtained at 150 K, metamagnetic behavior associated with the field–induced reverse transformation was clearly observed and the transformation magnetic fields could be detected. There was almost no change in the magnetically averaged XAS spectrum for Mn-L2,3 edges between in the martensite and in the magnetic field-induced austenite phases, however, it was visible for Ni. This implies that Ni 3d-electrons mainly contribute to martensitic transformation.
AB - In this study, X-ray absorption spectroscopy (XAS) experiments for Ni45Co5Mn36.7In13.3 metamagnetic shape memory alloy were performed under high magnetic fields up to 12 T using a pulsed magnet. Field–induced reverse transformation from martensite phase to austenite phase caused considerable changes in the magnetic circular dichroism (MCD) signals and the magnetic moments of the Mn, Ni, and Co with ferromagnetic coupling were determined. The spin magnetic moment, Mspin, and orbital magnetic moment, Morb, of Mn atom in the induced austenite ferromagnetic phase, estimated based on the sum-rule analysis, were 3.19 and 0.08 μB, respectively, resulting in an Morb / Mspin ratio of 0.03. In the element-specific magnetization curves obtained at 150 K, metamagnetic behavior associated with the field–induced reverse transformation was clearly observed and the transformation magnetic fields could be detected. There was almost no change in the magnetically averaged XAS spectrum for Mn-L2,3 edges between in the martensite and in the magnetic field-induced austenite phases, however, it was visible for Ni. This implies that Ni 3d-electrons mainly contribute to martensitic transformation.
KW - Field-induced reverse transformation
KW - Magnetic circular dichroism
KW - Metamagnetic shape memory alloy
KW - Ni-Co-Mn-In
KW - Pulsed magnetic field
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U2 - 10.1016/j.jallcom.2021.161590
DO - 10.1016/j.jallcom.2021.161590
M3 - Article
AN - SCOPUS:85114442600
SN - 0925-8388
VL - 890
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 161590
ER -