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Influence of Thermal Treatment on Domain Wall Dynamics in Glass-Coated Microwires

100%
Richter K., Varga R., Zhukov A.
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issue 5
738-739
EN
We have studied the effect of thermal treatment on amorphous glass-coated Fe_{40}Si_{7.5}B_{15} microwires. This microwire is characterized by transverse domain wall regime only, with maximum domain wall velocity of about 1500 m/s. Annealing at 200°C slightly increases its transverse domain wall velocity, probably due to the reduction of mechanical stresses during the thermal annealing. Annealing at 300°C leads to drastical increase of domain wall mobility and domain wall velocity of the transverse domain wall up to 2500 m/s. Moreover, vortex regime appears in this case. Thanks to it, maximum domain wall velocity of around 5000 m/s was observed.
2
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Aspects of Integrability in a Classical Model for Non-Interacting Fermionic Fields

100%
Grosse-Holz S., Engl T., Richter K., Urbina J.
Acta Physica Polonica A
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2015
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vol. 128
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issue 6
994-1001
EN
In this work we investigate the issue of integrability in a classical model for non-interacting fermionic fields. This model is constructed via classical-quantum correspondence obtained from the semiclassical treatment of the quantum system. Our main finding is that the classical system, contrary to the quantum system, is not integrable in general. Regarding this contrast it is clear that in general classical models for fermionic quantum systems have to be handled with care. Further numerical investigation of the system showed that there may be islands of stability in the phase space. We also investigated a similar model that is used in theoretical chemistry and found this one to be most probably integrable, although also here the integrability is not assured by the quantum-classical correspondence principle.
3
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Negative Mobility of Single Domain Wall in Magnetic Microwires

100%
Varga R., Richter K., Zhukov A.
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issue 5
747-748
EN
Here, we present the domain wall dynamics in thin magnetic wires that exhibit even negative mobility regime. Such a regime is well below the Walker limit and is a result of structural relaxation. It disappears at high frequencies and it can be enhanced by application of mechanical stress. Moreover, the domain wall velocity was found to be almost field-independent at certain measuring conditions. Anyway, the domain wall velocity remains quite high (> 450 m/s) in this regime.
4
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Imaging the Surface Domain Structure of Amorphous Glass-Coated Microwires by Bitter Colloid

100%
Richter K., Varga R., Thiaville A.
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vol. 126
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issue 1
72-73
EN
The fast domain wall dynamics of amorphous glass-coated microwires can be changed drastically by properly selected annealing temperature. Here, the effect of thermal annealing on the surface domain structure of microwires is examined. Imaging the surface domain structure by Bitter colloid revealed the periodic pattern in each studied sample. Thermal annealing of microwires results in the five times increase of the domain wall velocity, as compared to the as-cast state. Influence of the surface domain structure on the fast domain wall propagation in microwires is discussed.
5
Content available remote

Domain Wall Dynamics in Amorphous Microwires

88%
Richter K., Kostyk Y., Varga R., Zhukov A., Larin V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
7-10
EN
Here we present the domain wall dynamics in FeNi-based microwires with positive magnetostriction. Two different ranges were found which differs by the measured domain wall mobility. At low fields, the domain wall dynamics exhibit small mobility, whereas at higher field the domain wall mobility increases. The difference in the two regimes of the domain wall dynamics is treated in terms of the different domain wall structure. At low fields, the transversal domain wall is expected, with low domain wall mobility. At high field, the vortex-type domain wall with high domain wall mobility is created.
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