Exchange bias in phase-segregated Nd2/3Ca1/3MnO3 as a function of temperature and cooling magnetic fields
TLDR
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.Abstract:
Exchange bias (EB) phenomena have been observed in Nd2/3Ca1/3MnO3 colossal magnetoresistance perovskite below the Curie temperature $T_{C}$ = 70 K and attributed to an antiferromagnetic (AFM) - ferromagnetic (FM) spontaneous phase segregated state of this compound. Field cooled magnetic hysteresis loops exhibit shifts toward negative direction of the magnetic field axis. The values of exchange field $H_{EB}$ and coercivity $H_{C}$ are found to be strongly dependent of temperature and strength of the cooling magnetic field $H_{cool}$. These effects are attributed to evolution of the FM phase content and a size of FM clusters. A contribution to the total magnetization of the system due to the FM phase has been evaluated. The exchange bias effect decreases with increasing temperature up to $T_{C}$ and vanishes above this temperature with disappearance of FM phase. Relaxation of a non-equilibrium magnetic state of the compound manifests itself through a training effect also observed while studying EB in Nd2/3Ca1/3MnO3.read more
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Posted Content
The 10% Gd and Ti co-doped BiFeO$_3$: A promising multiferroic material
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TL;DR: In this paper, the structural analysis and phase identification of multiferroic ceramics were performed using Rietveld refinement, which indicated that the substitution of 10% Gd and Ti in place of Bi and Fe, respectively, in BiFeO$O$_3$ significantly enhances its multi-dimensional properties.
References
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TL;DR: In this paper, a large variety of experiments reviewed in detail here contain results compatible with the theoretical predictions, including phase diagrams of manganite models, the stabilization of the charge/orbital/spin ordered half-doped correlated electronics (CE)-states, the importance of the naively small Heisenberg coupling among localized spins, the setup of accurate mean-field approximations, and the existence of a new temperature scale T∗ where clusters start forming above the Curie temperature, the presence of stripes in the system, and many others.
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Journal ArticleDOI
Model for exchange bias in polycrystalline ferromagnet-antiferromagnet bilayers
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A new paradigm for exchange bias in polycrystalline thin films
TL;DR: A review and overview of a series of works generated in our laboratory over the last 5 years can be found in this paper, where the authors described the development and evolution of a new paradigm for exchange bias in polycrystalline thin films with grain sizes in the range 5-15nm.