Inverted near-surface hysteresis loops in heterogeneous (nanocrystalline/amorphous) Fe81Nb7B12 alloys

Shalyguina, E.E.; Škorvánek, I.; Švec, P.; Melnikov, V.A.; Abrosimova, N.M.

doi:10.1134/1.1809683

Cited by 6 publications

(8 citation statements)

References 25 publications

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“…Magnetic nanosized materials display a variety of unusual hysteresis loops, for the explanation of which several different models and possible physical mechanisms have been proposed. [29][30][31][32][33] Here, we discuss briefly the possible origin of the anomalous behavior compared with the conventional MF.…”

Section: Resultsmentioning

confidence: 98%

Advanced optical magnetic nanostructures fabricated by anodic aluminum oxide membranes and magnetic fluids

Chen

Zhang

2009

Journal of Applied Physics

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Optical magnetic nanostructures, based on anodic aluminum oxide membranes and magnetic fluids, were fabricated and investigated in both transmission and magneto-optical properties. A strong enhancement in transmission property has been found compared with the traditional magnetic fluids. Excellent magneto-optical characteristic was obtained: a negative differential magnetic linear dichroism was observed, quite different from the traditional Langevin type of magnetic fluids. This phenomenon was interpreted by an antiferromagnetic coupling between two types of magnetic grains having different average diameters in the nanocomposites. Based on its outstanding magneto-optical effects, it may open potentials for future integral optical devices.

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Section: Resultsmentioning

confidence: 98%

Advanced optical magnetic nanostructures fabricated by anodic aluminum oxide membranes and magnetic fluids

Chen

Zhang

2009

Journal of Applied Physics

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“…In all these cases, the behavior of constricted hystere sis loops can be qualitatively explained within the framework of a two phase model with two nonidenti cal phases, which are characterized by uniaxial mag netic anisotropy and antiferromagnetic interaction between them [62]. In armco iron used to produce Cu-Fe composites, the concentration of impurities is relatively small (~0.1 wt %) and the formation in it of regions that noticeably differ in composition is highly improbable.…”

Section: Magnetic Susceptibility and Magnetizationmentioning

confidence: 99%

“…Constricted hysteresis loops of magnetic suscepti bility were observed in Fe-Ni-Co alloys (the permin var effect) [59,60], in magnesium-zinc ferrites with an impurity of cobalt oxide subjected to heat treatment [60], in nanocrystalline boron containing magnetic [61,62], and also in the layered Ag/Ni [63] and CoO/Co [64] composites. In all these cases, the behavior of constricted hystere sis loops can be qualitatively explained within the framework of a two phase model with two nonidenti cal phases, which are characterized by uniaxial mag netic anisotropy and antiferromagnetic interaction between them [62].…”

Section: Magnetic Susceptibility and Magnetizationmentioning

confidence: 99%

Modifying the structure and properties of Cu-Fe composites by the methods of pressure formation

Белошенко

Dmitrenko

Chishko

2015

Phys. Metals Metallogr.

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In this survey, the results of the available studies are generalized and the effects of thermomechan ical treatment on the structure and the magnetic, mechanical, and electrical properties of Cu-Fe composites produced by the methods of casting, powder metallurgy, and severe plastic deformation are analyzed. The pri mary attention is paid to the method of packet hydroextrusion, which makes it possible to achieve a wide spectrum of diameters (3 nm-2 mm) of iron fibers and of the amount of fibers (1-8 × 10 8 ) in these composites with varying volume content (10-60%). The physical mechanisms of the revealed effects of the structural modification of the physicomechanical characteristics on different scale (macro, micro, and nano) levels are discussed.

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“…Shalyguina et al found different magnetic properties on the surface and in the volume of heterogeneous (nanocrystalline/amorphous) Fe 81 Nb 7 B 12 ribbons prepared by a melt spinning method [22]. Changes of the magnetic properties induced by annealing are more pronounced in the vicinity of the surface than in the bulk of the alloy.…”

Section: Inverted Hysteresis Loops Effectmentioning

confidence: 99%

The inverted hysteresis loops and exchange bias effects in amorphous/nanocrystalline Fe72Cu1V4Si15B8 ribbons at room temperature

et al. 2020

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?he influence of thermally induced microstructural transformations on magnetic properties of Fe72Cu1V4Si15B8 ribbon with combined amorphous/nanocrystalline structure is presented. The experiments showed that thermally induced structural changes are in correlation with the appearance of magnetic hysteresis, i.e. with inverted hysteresis loops (IHL) and exchange bias (EB) effects. It was found that the ratio of surface to volume of a ribbon sample have an influence on hysteresis loop appearance. The inverted hysteresis loops were observed for the 1.5 mm wide and 55 ?m thick alloy samples shorter than 10 mm, but for the samples longer than 10 mm hysteresis loops were normal. With an increase of annealing temperature, a shift of the hysteresis loops measured at room temperature was noticed. The highest positive exchange bias field Heb was observed for the sample annealed at 723 K, together with the lowest magnetic field at which the changes from inverted to normal hysteresis loop occurred. Annealing at the temperature of 823 K resulted in negative Heb.

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Inverted near-surface hysteresis loops in heterogeneous (nanocrystalline/amorphous) Fe81Nb7B12 alloys

Cited by 6 publications

References 25 publications

Advanced optical magnetic nanostructures fabricated by anodic aluminum oxide membranes and magnetic fluids

Advanced optical magnetic nanostructures fabricated by anodic aluminum oxide membranes and magnetic fluids

Modifying the structure and properties of Cu-Fe composites by the methods of pressure formation

The inverted hysteresis loops and exchange bias effects in amorphous/nanocrystalline Fe72Cu1V4Si15B8 ribbons at room temperature

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