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Title: Magnetic field dependence of nonlinear magnetic response and tricritical point in the monoaxial chiral helimagnet Cr 1 / 3 Nb S 2

We present a comprehensive study of the magnetization dynamics and phase evolution in the chiral helimagnet Cr 1/3NbS 2 , which realizes a chiral soliton lattice (CSL). The magnetic field dependence of the ac magnetic response is analyzed for the first five harmonic components, M (H ) (n = 1–5), using a phase sensitive measurement over a frequency range, f = 11–10 000 Hz. At a critical field, the modulated CSL continuously evolves from a helicity-rich to a ferromagnetic domain-rich structure, where the crossover is revealed by the onset of an anomalous nonlinear magnetic response that coincides with extremely slow dynamics. The behavior is indicative of the formation of a spatially coherent array of large ferromagnetic domains, which relax on macroscopic time scales. The frequency dependence of the ac magnetic loss displays an asymmetric distribution of relaxation times across the highly nonlinear CSL regime, which shift to shorter time scales with increasing temperature. We experimentally resolve the tricritical point at T TCP in a temperature regime above the ferromagnetic Curie temperature which separates the linear and nonlinear magnetic regimes of the CSL at the phase transition. A comprehensive phase diagram is constructed which summarizes the features of the fieldmore » and temperature dependence of the magnetic crossovers and phase transitions in Cr 1/3NbS 2.« less
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  1. Univ. of South Florida, Tampa, FL (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 21; Journal ID: ISSN 2469-9950
American Physical Society (APS)
Research Org:
Univ. of South Florida, Tampa, FL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; Chiral helimagnet; Chiral soliton lattice; Spin dynamics; Tricritical point; Magnetic phase diagram; ac susceptibility; Dzyaloshinskii-Moriya interaction; Metamagnetic transition
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1457814