Unusual field dependence of remanent magnetization in granular CrO 2: The possible relevance of piezomagnetism

A. Bajpai, R. Klingeler, N. Wizent, A. K. Nigam, Sang-Wook Cheong, B. Büchner

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Abstract

We present low field thermoremanent magnetization (TRM) measurements in granular CrO2 and composites of ferromagnetic (FM) CrO2 and antiferromagnetic (AFM) Cr2O3. TRM in these samples is seen to display two distinct timescales. A quasi-static part of remanence, appearing only in the low field regime, exhibits a peculiar field dependence. TRM is seen to first rise and then fall with increasing cooling fields, eventually vanishing above a critical field. Similar features in TRM have previously been observed in some antiferromagnets that exhibit the phenomenon of piezomagnetism. Scaling analysis of the TRM data suggest that presumably piezomoments generated in the AFM component drive the FM magnetization dynamics in these granular systems in the low field regime.

Original languageEnglish (US)
Article number096005
JournalJournal of Physics Condensed Matter
Volume22
Issue number9
DOIs
StatePublished - Feb 26 2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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