Field-induced vortex-like textures as a probe of the critical line in reentrant spin glasses

Journal article (2021)

Authors

N Martin Université Paris-Saclay, Paris
L.J. Bannenberg RST/Storage of Electrochemical Energy - AS , RID/TS/Instrumenten groep
M. Deutsch Lorraine University
C. Pappas RST/Neutron and Positron Methods in Materials - AS
Grégory Chaboussant Université Paris-Saclay, Paris
R. Cubitt Institut Laue Langevin
I. Mirebeau Université Paris-Saclay, Paris
Research Group
RST/Storage of Electrochemical Energy (AS) (TU Delft)
Copyright: © 2021 N. Martin, L.J. Bannenberg, M. Deutsch, C. Pappas, G. Chaboussant, R. Cubitt, I. Mirebeau
DOI: https://doi.org/10.1038/s41598-021-99860-2
More Info
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Published Date

2021

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Storage of Electrochemical Energy

Abstract

We study the evolution of the low-temperature field-induced magnetic defects observed under an applied magnetic field in a series of frustrated amorphous ferromagnets (Fe1-xMnx)75P16B3Al3 (“a-Fe1-xMnx”). Combining small-angle neutron scattering and Monte Carlo simulations, we show that the morphology of these defects resemble that of quasi-bidimensional spin vortices. They are observed in the so-called “reentrant” spin-glass (RSG) phase, up to the critical concentration xC≈ 0.36 which separates the RSG and “true” spin glass (SG) within the low temperature part of the magnetic phase diagram of a-Fe1−xMnx. These textures systematically decrease in size with increasing magnetic field or decreasing the average exchange interaction, and they finally disappear in the SG sample (x= 0.41), being replaced by field-induced correlations over finite length scales. We argue that the study of these nanoscopic defects could be used to probe the critical line between the RSG and SG phases.