Interaction of spin waves with magnetic two-level systems in amorphous magnets

Korenblit, I. Ya.; Maleev, S. V.; Shender, E. F.

doi:10.1103/physrevb.33.624

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…This could open a promising route towards the engineering of bulk systems with well defined sizes and density ranges, for instance, the design of vortices by a controllable distribution of bonds. Moreover, while the observed vortices cannot be moved since they are bound to the Mn-Mn pairs, their interaction with electric currents [68,69] and spin waves [70][71][72] is nontrivial. In both cases, the class of frustrated ferromagnets studied in this paper might offer novel ways to encode complex information into electron and heat pulses.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

Spin textures induced by quenched disorder in a reentrant spin glass: Vortices versus “frustrated” skyrmions

et al. 2018

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Reentrant spin glasses are frustrated disordered ferromagnets developing vortexlike textures under an applied magnetic field. Our study of a Ni 0.81 Mn 0.19 single crystal by small angle neutron scattering clarifies their internal structure and shows that these textures are randomly distributed. Spin components transverse to the magnetic field rotate over length scales of 3-15 nm in the explored field range, decreasing as field increases according to a scaling law. Monte Carlo simulations reveal that the internal structure of the vortices is strongly distorted and differs from that assumed for "frustrated" skyrmions, built upon a competition between symmetric exchange interactions. Isolated vortices have small noninteger topological charge. The vortices keep an anisotropic shape on a three-dimensional lattice, recalling "croutons" in a "ferromagnetic soup." Their size and number can be tuned independently by the magnetic field and concentration x (or heat treatment), respectively. This opens an original route to understand and control the influence of quenched disorder in systems hosting nontrivial spin textures.

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Section: Outlook and Conclusionmentioning

confidence: 99%

Spin textures induced by quenched disorder in a reentrant spin glass: Vortices versus “frustrated” skyrmions

et al. 2018

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“…From a more theoretical point of view magnon scattering by magnetic two-level systems (MTLS) has been suggested [21]. However, such a contribution is also very unlikely to be present in our strong ferromagnetic amorphous Fe7$i10B13 sample.…”

mentioning

confidence: 78%

“…-Amorphous magnetic alloys have been the subject of intense investigations in the last years, particularly, concerning the study of magnonlike excitations in amorphous ferromagnets. Inelastic neutron scattering experiments reveal dispersion relations with a quadratic dependence of the energy of the magnon wave vector [ l ,21. The…”

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confidence: 99%

Evidence of Magnon Thermal Transport in a Ferromagnetic Glassy Metal

Gronert

Herlach²,

Wassermann

1988

Europhys. Lett.

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The thermal conductivity is studied at low temperatures and high magnetic fields on amorphous (Fel-rNir)77Si10B13 alloys. The magnetic state of the samples is systematically altered by a change of the Ni concentration. In the spin glass regime (x = 0.9) phonon scattering from magnetic two-level systems is observed. The measurements on the strongly ferromagnetic alloy (x = 0) give evidence of energy transport via long-range nonlocalized magnons. This spin wave heat conductivity is limited by magnon-electron scattering.Introduction. -Amorphous magnetic alloys have been the subject of intense investigations in the last years, particularly, concerning the study of magnonlike excitations in amorphous ferromagnets. Inelastic neutron scattering experiments reveal dispersion relations with a quadratic dependence of the energy of the magnon wave vector [ l ,21. The

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Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

Öner

Kamer

Ross

2006

Journal of Applied Physics

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Electrical resistivity measurements have been carried out for both flash-evaporated reentrant spin glasses ͑RSGs͒ ͑Ni 76−x Pd x ͒Mn 24 and Ni 74.5 Mn 23.5 Pd 2 , as well as Ni 75 Mn 23 Pd 2 , a pure SG. These measurements were carried out at temperatures down to 4 K. We observed a very deep resistivity minimum at about 75 K for Ni 74 Mn 24 Pd 2 . It was found previously ͓Öner et al., J. Appl. Phys. 89, 7044 ͑2001͔͒ that this sample shows the largest coercivity and exchange unidirectional anisotropy among these films. In addition, magnetization measurements show that this takes place just on the border of the RSG such that it could be handled as a superparamagnetic sample. Previously it was assumed that the exchange bias created in the sample between the domains plays the dominant role in the resistivity minimum. On the other hand, in order to account for the temperature dependence of the resistivity below the minimum we have analyzed these data using the Kondo, two-channel Kondo, weak localization, and Cochrane models for structural disorder based on the Anderson mechanism. We have deduced that the two-channel Kondo model gives the best agreement with the data; a logarithmic temperature dependence ⌬ ͑T͒ = ␤ log 10 ͑T / T K ͒, was observed at the temperatures below T f accompanied by a resistivity behavior ⌬ ͑T͒ = 0m ͑0͒͑1−␣T 1/2 ͒, at lower temperatures. All parameters deduced from the fitting correlate consistently with the strength of the exchange anisotropy and coercivity in the RSG films, and thus provide a separate measure of the presence of antiferromagnetically coupled domains in these materials.

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Interaction of spin waves with magnetic two-level systems in amorphous magnets

Cited by 7 publications

References 3 publications

Spin textures induced by quenched disorder in a reentrant spin glass: Vortices versus “frustrated” skyrmions

Spin textures induced by quenched disorder in a reentrant spin glass: Vortices versus “frustrated” skyrmions

Evidence of Magnon Thermal Transport in a Ferromagnetic Glassy Metal

Effect of exchange bias on the electrical resistivity of Pd doped NiMn thin films: Two-channel Kondo system

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