GMI in the reentrant spin-glass Fe90Zr10 alloy: Investigation of the spin dynamics in the MHz frequency regime
authors Ribeiro, PRT; Ramirez, JMM; Vidyasagar, R; Machado, FLA; Rezende, SM; Dahlberg, ED
nationality International
journal APPLIED PHYSICS LETTERS
keywords RICH FE-ZR; GIANT MAGNETOIMPEDANCE; ELECTRICAL-RESISTIVITY; AMORPHOUS ALLOY; TRANSITION; TEMPERATURE; BEHAVIOR; MAGNETORESISTANCE; DEPENDENCE; FEXZN1-XF2
abstract 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 tau (similar to 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 tau (=1/f) versus the reduced critical temperature shows two distinct regimes in the time-domain: (1) a critical slowing-down is observed for values tau > 3 x 10(-3) s; and (2) for 7 x 10(-8) <= tau <= 3 x 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 z nu, and 1.6 x 10(-7) s for the microscopic relaxation time tau(0). The product of the exponents is appropriate for an Ising spin glass. Published by AIP Publishing.
publisher AMER INST PHYSICS
issn 0003-6951
year published 2016
volume 109
issue 10
beginning page 127
ending page 130
digital object identifier (doi) 10.1063/1.4962534
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000384402900026
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