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1
Content available remote Magnetic properties of mechanically milled nanosized Mn
Wu X. J., Xu X. W., Sun X. S.
Materials Science Poland
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2009
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Vol. 27, No. 3
857--864
EN
Nanosized Mn powders were fabricated by milling Mn flakes in pure ethyl alcohol followed by homogenization. XRD analysis confirms single-phase characterization of the product and shows it has a grain size of 40 nm. The ZFC and FC magnetizations exhibit a large irreversibility with onset of about 60 K. The fit of the Curie-Weiss relation indicates strong AFM interaction in the considered system. A large coercive field and shifted hysteresis loops, i.e. He = 83.6 kA/m, are observed at 5 K in the 2 T field cooling case. The analysis indicates that surface anisotropy can lead to the occurrence of large exchange bias.
2
Content available remote Isotropic effects in exchange-biased ferromagnetic /antiferromagnetic bilayers
Błachowicz T.
Materials Science Poland
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2008
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Vol. 26, No. 1
21--26
EN
Novel, direction-independent (rotatable) spin-wave frequency modifications in a ferromagnetic layer biased by an antiferromagnetic film, revealed recently with Brillouin light scattering, have been analyzed. Physical conditions needed for the rotatable behaviour observations in epitaxial layers have been presented. The omni-rotatable down-shift, being a function of a spin-wave frequency, was distinguished from the up-shift of spin-wave frequencies induced by the exchange-bias. Additionally, the rotatable anisotropy constant was estimated from the available BLS results.
3
Content available remote Carbon encapsulated iron nanowires
Ramirez R., Weissmann M., Garcia G., Kiwi M.
Materials Science Poland
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2006
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Vol. 24, No. 4
883--890
EN
A study of the structural and magnetic properties of carbon encapsulated iron nanowires is presented. The influence of carbon presence on iron magnetic ordering by means of an ab initio computer simulation has been studied. For wires tightly encapsulated, i.e. with large ratio of wires and nanotubes radii, the presence of carbon strongly alters Fe magnetic configuration of free standing wires, in some cases yielding antiferromagnetic ordering. The energy differences between ferromagnetic and antiferromagnetic phases are small enough to allow their coexistence in a nanowire, which is in agreement with the experimental evidence of exchange-bias in such systems.
4
Content available remote Analysis of magnetisation reversal at the exchange-biased interface using Ising approach
Błachowicz T., Wieja M.
Materials Science Poland
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2006
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Vol. 24, No. 3
643--648
EN
This paper provides the results of exchange-bias simulation of a single ferromagnetic (FM) layer coupled to a quenched antiferromagnetic (AFM) region using a Random Field Ising Model (RFIM) approach. Using the RFIM algorithm the shapes of exchange-biased hysteresis loops, featuring perpendicular magnetic anisotropies, were obtained. Providing a possible explanation of this effect the recognized stable part of an interface magnetisation represented by unreversed spins at the interface was evidently simulated. Obtained results are consistent with the Domain State Model (DSM) model, where a part of the AFM interface magnetisation is stable during hysteresis loop creation
5
Simulation of Exchange-Biased 2d-Interface Using the Random Field Ising Model with a Diluted Lattice
Błachowicz T.
Molecular and Quantum Acoustics
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2004
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Vol. 25
29-43
EN
What is presented here are the preliminary results of exchange-bias simulation of a single ferromagnetic layer (FM) coupled to an antiferromagnetic (AFM) region with a diluted lattice using a Random Field Ising Model approach. Dilution is simulated by locally enhancement of ferromagnetic coupling constants calculated at random positions with a given dilution level. The results show a direct correlation between exchange-bias and a number of unreversed spins at the FM/AFM interface. Within a dilution level, two components were identified; a global random dilution and a local dilution efficiency. The latter is represented by the coupling constant enhancement. Interpretation of this interfacial effect
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