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1
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Phase Transitions in Fe-Rh Alloys Induced by Temperature

100%
Rodionov V., Rodionova V., Annaorazov M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
445-447
EN
This research work was aimed to find the composition of equiatomic Fe-Rh alloy and to find the way of preparation of samples with extremely narrow thermal hysteresis and repeatable results. Alloys with content of Fe from 48 up to 52 at.% were examined. Fe-Rh alloys were prepared in forms of bulk piece, plate and wire. The plates of alloys were found to be more perspective for further investigations. The influence of parameters of ingot and samples treatments on antiferromagnetic-ferromagnetic transition was studied. The ways of narrowing of temperature hysteresis were established.
2
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Dependence of Exchange Bias Field on Thickness of Antiferromagnetic Layer in NiFe/IrMn Structures

100%
Dzhun I., Chechenin N., Chichay K., Rodionova V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
555-557
EN
Magnetic properties of ferromagnetic/antiferromagnetic thin-films structures for spin-valve applications have been studied. Multilayer structures of Ta/Co/IrMn/Ta and Ta/FeNi/IrMn/Ta were deposited on Si substrate at room temperature by DC magnetron sputtering. Thickness of the antiferromagnetic layer changed from 10 to 50 nm. The coercive force was found to be non-monotonic function of the antiferromagnetic layer thickness. The exchange bias for 30-50 nm antiferromagnetic layers (73 Oe) is about 10 Oe larger than for 10-20 nm antiferromagnetic layers. Moreover, it was demonstrated that the alternative sequence of the deposition (antiferromagnetic layer on the top or below the ferromagnetic layer) leads to dramatic changes of structures magnetic properties.
3
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Effect of Temperature and Time of Stress Annealing on Magnetic Properties of Amorphous Microwires

88%
Chichay K., Rodionova V., Ipatov M., Zhukova V., Zhukov A.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 2
600-602
EN
In this work we studied influence of time and temperature of stress annealing on magnetic properties of amorphous Co-based and CoFeNi-based microwires. We showed that this type of treatment can be very effective for manipulation of magnetic properties of amorphous ferromagnetic glass-coated microwires. Co-based microwires keep S-shape hysteresis loop after any annealing. Annealing of Co-based microwires at different conditions allows tailoring of the saturation field. CoFeNi-based microwires present either S-shape or rectangular shape of the hysteresis loops depending on the value of the axial stress during the annealing. We demonstrated the possibility to change the switching field of microwires with acquired bistability in the range from 0.5 to 25 A/m.
4
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Temperature Dependent Magnetic and Structural Properties of Ni-Mn-Ga Heusler Alloy Glass-Coated Microwires

76%
Shevyrtalov S., Chichay K., Ershov P., Khovaylo V., Zhukov A., Zhukova V., Rodionova V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
603-605
EN
We report on structural and magnetic properties of glass-coated microwires of Ni-Mn-Ga-based Heusler alloys. Structural characterization of the as-prepared microwires revealed that they have a cubic structure at room temperature. It is shown that magnetic properties of microwires can be tailored by heat treatment as well as by removing the glass coating. Specifically, annealing of the microwires has a marked influence of the Curie temperature T_{C} which increases significatly in the heat-treated samples. Release of internal stresses in the microwires by removing the glass coating causes magnetization and the Curie temperature to decrease. This allowed us to conclude that in the studied microwires the magnetostriction constant is positive and estimate the value of internal stresses as being roughly equal to 1.5 GPa.
5
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Magnetic Properties of CoFeSiB/CoNi, CoFeSiB/FeNi, FeSiB/CoNi, FeSiB/FeNi Biphase Microwires in the Temperature Range 295-1200 K

76%
Iglesias I., El Kammouni R., Chichay K., Perov N., Vazquez M., Rodionova V.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
591-593
EN
We have studied the magnetic properties of two series of magnetically biphase microwires with 1 μm thickness of CoNi-based hard or FeNi-based soft shells with a core of FeSiB or FeCoSiB glass-coated microwires. The magnetic properties were analyzed as a function of temperature in the range from 295 K to 1200 K using a vibrating sample magnetometer. Analysis of the magnetization reversal of each phase with measuring temperature has been performed.
6
Content available remote

Magnetic Properties of Magnetoplasmonic Crystals Based on Commercial Digital Discs

76%
Belyaev V., Grunin A., Chichay K., Shevyrtalov S., Fedyanin A., Rodionova V.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 2
546-548
EN
Several topics of photonics are targeted at the enhancement of magneto-optical response in the nanostructures. One of the approaches is creating of the magnetoplasmonic crystals based on the substrates made of the digital discs (CD, DVD, BD) with ferromagnetic film. It is necessary to investigate in-plane anisotropy of magnetoplasmonic crystals and influence of the ferromagnetic layer thickness on increase of the mean free path of edge magnetoplasmons. Ni-based magnetoplasmonic crystals were investigated using the vibrating sample magnetometer by LakeShore. All samples had anisotropic in-plane magnetic properties because of the induced anisotropy caused by the stripe-like periodic structure of the substrates. A step-like behaviour of the hysteresis loops in case of the transverse plasmon propagation way was observed for Ni-based magnetoplasmonic crystals. Measurements along the plasmon propagation way showed near-rectangular hysteresis loops typical for the Ni-based thin films for certain samples. Step-like behaviour of the hysteresis loops for the Ni-based magnetoplasmonic crystals can be explained as a result of interaction between Ni films that covered the top and the lateral sides of the substrate stripes.
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