Local probing of arrested kinetics in Gd5Ge4

TitleLocal probing of arrested kinetics in Gd5Ge4
Publication TypeJournal Article
Year of Publication2008
AuthorsMoore JD, Perkins GK, Morrison K, Ghivelder L, Chattopadhyay MK, Roy SB, Chaddah P, Gschneidner KA, Pecharsky VK, Cohen LF
Journal TitleJournal of Physics-Condensed Matter
Date Published11/01
Type of ArticleArticle
ISBN Number0953-8984
Accession NumberISI:000260469700019
KeywordsGLASS-TRANSITION, temperature

We present spatially localized magnetic relaxation measurements of the first-order magnetostructural transition in Gd5Ge4 using a scanning Hall probe imaging technique. Relaxation measurements were performed at 6, 10 and 35 K to probe the field-increasing antiferromagnetic (AFM) to ferromagnetic (FM) transition and, when it can occur, the field-decreasing FM to AFM transition. We demonstrate that localized regions relax with time towards the ground state for a given field and temperature and observe different magnetic behaviours at the three measurement temperatures. In particular, the observed magnetic relaxation at 6 K is consistent with the idea of an arrested state at this temperature. Our scanning Hall probe imaging data give an insight into the phase nucleation and growth process of the martensitic-like magnetostructural first-order transition in Gd5Ge4.

Alternate JournalJ. Phys.-Condes. Matter