Anisotropic magnetic deflagration in single crystals of Gd5Ge4

TitleAnisotropic magnetic deflagration in single crystals of Gd5Ge4
Publication TypeJournal Article
Year of Publication2012
AuthorsVelez S, Hernandez JM, Garcia-Santiago A, Tejada J, Pecharsky VK, Gschneidner KA, Schlagel DL, Lograsso TA, Santos PV
Journal TitlePhysical Review B
Volume85
Pages054432
Date Published02
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000300828700001
Keywordsgd-5(si2ge2), mn-12, transition
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.

URL<Go to ISI>://WOS:000300828700001
DOI10.1103/PhysRevB.85.054432
Alternate JournalPhys. Rev. B