Inverted hysteresis in exchange biased Cr2O3 coated CrO2 particles

R. K. Zheng, Hui Liu, Y. Wang, X. X. Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Exchange bias and inverted hysteresis loops were observed in the Cr 2O3 coated CrO2 particles with a wide distribution of the blocking temperature. The ferromagnetic coupling between the CrO2 cores and Cr2O2 shell is responsible for exchange bias observed below 292 K. In the temperature range of 261 K- ∼ 340 K, the particles show inverted hysteresis loops, i.e., the negative remanence and coercivity. The most interesting observation is that the particles show an exchange-biased (or shifted) inverted hysteresis loops in between 261 K and 292 K; and that the maximum negative remanence appears at 292 K where exchange bias disappears. An antiferromagnetic type of interaction between the blocked particles and the superparamagnetic particles is believed to be responsible to the inverted hysteresis loops.

Original languageEnglish (US)
Pages (from-to)5370-5372
Number of pages3
JournalJournal of Applied Physics
Issue number9
StatePublished - Nov 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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