TY - JOUR
T1 - Contribution of Pt impurities to spin configurations in the reentrant spin glass NiMn
AU - Ando, T.
AU - Ohta, E.
AU - Sato, T.
N1 - Funding Information:
One of the authors (T.A.) wishes to thank T. Taniyama and H. Yanagihara for useful discussions. This work was partially supported under a Grant-in-Aid for Science Research from the Japanese Ministry of Education, Science and Culture, by the Saneyoshi Scholarship Foundation, by a Research Grant from the Mazda Foundation, and by the Casio Science Promotion Foundation.
PY - 1996/11
Y1 - 1996/11
N2 - We have measured the temperature-dependent linear and nonlinear susceptibilities of the reentrant spin glass Ni100-xMnx (x = 22.4, 23.0 and 23.4) and Pt-doped samples Ni100-x-yPtyMnx (x = 23.5, y = 0.6 and 1.1) in order to elucidate the thermal evolution of spin configurations in the low-temperature states. The nonlinear susceptibility in the reentrant spin glasses Ni77.0Mn23.0 and Ni76.6Mn23.4 shows a peak corresponding to the appearance of the vortex-like spin structure in addition to conventional phase transitions. Such an extra peak becomes more pronounced in Ni75.9Pt0.6Mn23.5 and Ni75.4Pt1.1Mn23.5 with increasing Pt content, suggesting the appearance of a long-range vortical spin arrangement above the spin freezing temperature. In these Pt-doped samples, the singularity due to the spin glass transition becomes indistinct and the ferromagnetic transition disappears. We explain this contribution of Pt to the spin configuration in terms of the enhanced magnetic anisotropy due to a Dzyaloshinsky-Moriya-type interaction.
AB - We have measured the temperature-dependent linear and nonlinear susceptibilities of the reentrant spin glass Ni100-xMnx (x = 22.4, 23.0 and 23.4) and Pt-doped samples Ni100-x-yPtyMnx (x = 23.5, y = 0.6 and 1.1) in order to elucidate the thermal evolution of spin configurations in the low-temperature states. The nonlinear susceptibility in the reentrant spin glasses Ni77.0Mn23.0 and Ni76.6Mn23.4 shows a peak corresponding to the appearance of the vortex-like spin structure in addition to conventional phase transitions. Such an extra peak becomes more pronounced in Ni75.9Pt0.6Mn23.5 and Ni75.4Pt1.1Mn23.5 with increasing Pt content, suggesting the appearance of a long-range vortical spin arrangement above the spin freezing temperature. In these Pt-doped samples, the singularity due to the spin glass transition becomes indistinct and the ferromagnetic transition disappears. We explain this contribution of Pt to the spin configuration in terms of the enhanced magnetic anisotropy due to a Dzyaloshinsky-Moriya-type interaction.
KW - Magnetic anisotropy
KW - NiMn
KW - Nonlinear susceptibility
KW - Reentrant spin glass
KW - Vortex spin structure
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U2 - 10.1016/S0304-8853(96)00336-8
DO - 10.1016/S0304-8853(96)00336-8
M3 - Article
AN - SCOPUS:0030285716
VL - 163
SP - 277
EP - 284
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 3
ER -