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Type: Artigo de periódico
Title: Magnetic properties of metastable Gd-Cr alloys
Author: Rouxinol, FP
Gadioli, GZ
Gelamo, RV
dos Santos, AO
Cardoso, LP
Gama, S
de Moraes, MAB
Abstract: We report on the magnetization, magnetocaloric effect, magnetic ordering temperatures, saturation magnetic moments and anisotropy of sputter-deposited Gd(x)Cr(1-x) alloys with Gd atomic concentrations, x, ranging from 0.13 to 0.52. The complex magnetic nature of the Gd-Cr films was revealed from the M x H isotherms, which do not show saturation even at an applied field of 70 kOe and a temperature of 2 K and do not exhibit a linear behavior at higher temperatures. For some of the samples, the isotherms were used to determine the isothermal entropy variation as a function of temperature, for a change of 50 kOe in the applied magnetic field. The saturation magnetic moment varies with x and follows the dilution law, implying that the Cr atoms do not contribute to the total moment of the Gd-Cr alloys. Both static magnetization and dynamic susceptibility measurements reveal the existence of a magnetic glassy behavior in the alloys, which occurs below a freezing temperature. The existence of anisotropy at low temperatures for all samples was revealed by their M x H hysteresis loops from which the in-plane coercive fields, H(c), were determined. A monotonical increase in H(c) with increasing Gd concentration was observed. (C) 2011 Elsevier B.V. All rights reserved.
Subject: ac susceptibility
Spin glass-like
Amorphous alloys
Coercive field
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2011.02.040
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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