Exchange bias and anomalous vertical shift of the hysteresis loops in milled Fe/MnO2 material

Formation, characterization and magnetic properties of maghemite γ-Fe2O3 nanoparticles in borate glasses

“…Noteworthy, there is a difference between low temperature hysteresis loops measured for samples cooled in two regimes, viz., FC and ZFC. The FC loop demonstrates a vertical shift similar to that observed in nanostructured Fe/MnO 2 [17], Fe/CoO [18] nanocomposites. Authors of the cited references considered this shift to be due to spins pinned at the interface between ferromagnetic and antiferromagnetic components.…”

Blocking temperature in nanocrystalline systems with “alloy-like” ferromagnetic–antiferromagnetic heterogeneous morphology

“…In experiments, the research on the effect of ratio varies of FM to AFM phase of systems on T B has been engaged in the various metal alloys or oxides with high geometrical frustration [9,13,19,28], and many new phenomena have been observed. However, a definite relation between the blocking temperature and the phase content in such systems has not been obtained directly.…”

Monte Carlo Studies of Magnetic Nanoparticles

“…Although in the decades that followed the exchange bias research focused mainly on thin film systems, the production of magnetic nanoparticles with core/shell morphology and their study have renewed interest in the exchange bias phenomena (Nogues et al, 2005). In addition to the exchange bias shift a vertical shift (DM) of the hysteresis loops has also been observed in FM/AFM core/shell nanoparticles attributed to the uncompensated spins of the shell (Passamani, 2006). We have investigated the exchange bias mechanism and the factors that influence the exchange bias behaviour in FM core/AFM shell nanoparticles.…”