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Article
Anisotropic magnetic deflagration in single crystals of Gd5Ge4
Physical Review B
  • S. Vélez, Universitat de Barcelona
  • J. M. Hernandez, Universitat de Barcelona
  • A. García-Santiago, Universitat de Barcelona
  • J. Tejada, Universitat de Barcelona
  • Vitalij K. Pecharsky, Iowa State University
  • Karl A. Gschneidner, Jr., Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • P. V. Santos, Paul-Drude-Institut für Festkörperelektronik
Document Type
Article
Publication Date
2-28-2012
DOI
10.1103/PhysRevB.85.054432
Abstract

Experimental evidence of the anisotropy of the magnetic deflagration associated with the low-temperature first-order antiferromagnetic (AFM) → ferromagnetic (FM) phase transition in single crystals of Gd5Ge4 is reported. The deflagrations were induced by controlled pulses of surface acoustic waves (SAW) allowing to explore both the magnetic field and temperature dependencies on the characteristic times of the phenomenon. The study was done using samples with different geometries and configurations between the SAW pulses and the direction of the applied magnetic field with respect to the three main crystallographic directions of the samples. The effect of temperature is nearly negligible, whereas a strong magnetic field dependence is observed to correlate with the magnetic anisotropy of the sample. Finally, the role of the SAW pulses in both the ignition and formation of the deflagration front was also studied, and we show that the thermal diffusivity of Gd5Ge4 must be anisotropic.

Comments

This article is from Physical Review B 85 (2012): 054432, doi:10.1103/PhysRevB.85.054432.

Copyright Owner
American Physical Society
Language
en
Date Available
2013-09-20
File Format
application/pdf
Citation Information
S. Vélez, J. M. Hernandez, A. García-Santiago, J. Tejada, et al.. "Anisotropic magnetic deflagration in single crystals of Gd5Ge4" Physical Review B Vol. 85 Iss. 5 (2012) p. 054432
Available at: http://works.bepress.com/d_l_schlagel/48/