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Title: GMI in the reentrant spin-glass Fe 90Zr 10 alloy: Investigation of the spin dynamics in the MHz frequency regime

Giant magnetoimpedance (GMI) in the reentrant spin-glass (SG) phase of ferromagnetic Fe 90Zr 10 is reported. The temperature (T) dependence of the GMI allows the investigation of the spin dynamics in the SG phase in the MHz frequency regime and thus very short relaxation times τ (~10 -8 s). The GMI shows a broad maximum around 150 K and diminishes with decreasing T below the glass temperature T g of 15 K. The magnetic permeability data obtained from the GMI data show the general features observed in the ac magnetic susceptibility measured at lower frequencies (10 ≤ f ≤ 10 4 Hz), yielding values of T f (=T g(f)) that allow testing the validity of the power-law scaling used for describing the dynamics of SG-phases up to 15 MHz. A log-log plot of τ (=1/f) versus the reduced critical temperature shows two distinct regimes in the time-domain: (1) a critical slowing-down is observed for values τ > 3 × 10 -3 s; and (2) for 7 × 10 -8 ≤ τ ≤ 3 × 10 -3 s. In the latter case a fitting to the power-law yields the value 7.4 for the product of the critical exponents zν, and 1.6more » × 10 -7 s for the microscopic relaxation time τ 0. In conclusion, the product of the exponents is appropriate for an Ising spin glass.« less
Authors:
 [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2]
  1. Univ. Federal de Pernambuco, Recife, Pernambuco (Brazil). Dept. de Fisica
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
Publication Date:
Grant/Contract Number:
SC0013599
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 10; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1467896
Alternate Identifier(s):
OSTI ID: 1323561

Ribeiro, P. R. T., Ramírez, J. M. M., Vidyasagar, R., Machado, F. L. A., Rezende, S. M., and Dahlberg, E. Dan. GMI in the reentrant spin-glass Fe90Zr10 alloy: Investigation of the spin dynamics in the MHz frequency regime. United States: N. p., Web. doi:10.1063/1.4962534.
Ribeiro, P. R. T., Ramírez, J. M. M., Vidyasagar, R., Machado, F. L. A., Rezende, S. M., & Dahlberg, E. Dan. GMI in the reentrant spin-glass Fe90Zr10 alloy: Investigation of the spin dynamics in the MHz frequency regime. United States. doi:10.1063/1.4962534.
Ribeiro, P. R. T., Ramírez, J. M. M., Vidyasagar, R., Machado, F. L. A., Rezende, S. M., and Dahlberg, E. Dan. 2016. "GMI in the reentrant spin-glass Fe90Zr10 alloy: Investigation of the spin dynamics in the MHz frequency regime". United States. doi:10.1063/1.4962534. https://www.osti.gov/servlets/purl/1467896.
@article{osti_1467896,
title = {GMI in the reentrant spin-glass Fe90Zr10 alloy: Investigation of the spin dynamics in the MHz frequency regime},
author = {Ribeiro, P. R. T. and Ramírez, J. M. M. and Vidyasagar, R. and Machado, F. L. A. and Rezende, S. M. and Dahlberg, E. Dan},
abstractNote = {Giant magnetoimpedance (GMI) in the reentrant spin-glass (SG) phase of ferromagnetic Fe90Zr10 is reported. The temperature (T) dependence of the GMI allows the investigation of the spin dynamics in the SG phase in the MHz frequency regime and thus very short relaxation times τ (~10-8 s). The GMI shows a broad maximum around 150 K and diminishes with decreasing T below the glass temperature Tg of 15 K. The magnetic permeability data obtained from the GMI data show the general features observed in the ac magnetic susceptibility measured at lower frequencies (10 ≤ f ≤ 104 Hz), yielding values of Tf (=Tg(f)) that allow testing the validity of the power-law scaling used for describing the dynamics of SG-phases up to 15 MHz. A log-log plot of τ (=1/f) versus the reduced critical temperature shows two distinct regimes in the time-domain: (1) a critical slowing-down is observed for values τ > 3 × 10-3 s; and (2) for 7 × 10-8 ≤ τ ≤ 3 × 10-3 s. In the latter case a fitting to the power-law yields the value 7.4 for the product of the critical exponents zν, and 1.6 × 10-7 s for the microscopic relaxation time τ0. In conclusion, the product of the exponents is appropriate for an Ising spin glass.},
doi = {10.1063/1.4962534},
journal = {Applied Physics Letters},
number = 10,
volume = 109,
place = {United States},
year = {2016},
month = {9}
}