Exchange bias and its phase reversal in the zero magnetization admixed rare earth intermetallics
TLDR
In this paper, the authors report on the magnetically ordered alloys possessing the feature of unidirectional anisotropy, which reverses its sign across a characteristic temperature.Abstract:
Exchange bias effect is an important attribute in several device applications. Traditionally, it is discussed as a form of exchange anisotropy at the interface between the ferromagnetic/antiferromagnetic layers of two distinct systems. We report here on the magnetically ordered alloys possessing the feature of unidirectional anisotropy, which reverses its sign across a characteristic temperature. These are admixed rare earth intermetallics, comprising two dissimilar rare earth (RE) ions, belonging to the two different halves of the 4f-series and imbibing the notion of ferromagnetic coupling between the spins of all 4f-rare earth ions and that of the conduction electrons. Magnetic moments of dissimilar RE ions in such admixed alloys, however, get antiferromagnetically coupled and they display magnetic compensation feature such that the field induced reversal in the orientation of the magnetic moments of dissimilar rare earth ions happens across the compensation temperature (Tcomp). Above a threshold field, the conduction electron polarization also reverses its sign across Tcomp, this is argued to correlate with the observed phase reversal in the exchange bias field.read more
Citations
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Exchange bias effect in alloys and compounds
TL;DR: The phenomenology of exchange bias effects observed in structurally single-phase alloys and compounds but composed of a variety of coexisting magnetic phases such as ferromagnetic, antiferromagnetic.
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Observation of tunable exchange bias in Sr2YbRuO6
TL;DR: The double perovskite compound, Sr2YbRuO6, displays reversal in the orientation of magnetic moments along with negative magnetization due to an underlying magnetic compensation phenomenon.
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Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields
TL;DR: In this article, the exchange bias effect was observed in Nd2/3Ca1/3MnO3 colossal magnetoresistance perovskite below the Curie temperature of 70 K and attributed to an antiferromagnetic (AFM)-ferromagnetic spontaneous phase segregated state of this compound.
Journal ArticleDOI
Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields
TL;DR: In this paper, the exchange bias effect decreases with increasing temperature up to TC and vanishes above this temperature with disappearance of the antiferromagnetic-ferromagnetic (FM) spontaneous phase segregated state of this compound.
Journal ArticleDOI
Unusual lattice constant changes and tunable magnetic moment compensation in Mn50−xCo25Ga25+x alloys
TL;DR: In this paper, the lattice parameter changes and tunable magnetic moment compensation in Mn50−xCo25Ga25+x (x = 0-25) Heusler alloys by substituting Ga for Mn.
References
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H.-G. Purwins,A. Leson +1 more
TL;DR: In this article, the most important magnetic properties of non-S-state ferromagnetic single crystalline REAl2 (RE ≡ rare earch) intermetallic compounds with well localized 4f electrons are reviewed.
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Field sensing using the magnetoresistance of IrMn exchange-biased tunnel junctions
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Zero-Magnetization Ferromagnet Proven by Helicity-Switching Compton Scattering
TL;DR: The asymmetry in Compton-scattering intensity when switching between right- and left-handed polarization of incident 150-keV synchrotron radiation provides decisive proof that ferromagnetic order is really there, and that spin and orbital magnetic contributions cancel.