Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose–Einstein condensate

Matthias R. Schweizer; Franziska Kühn; Victor S. L'vov; Anna Pomyalov; Georg von Freymann; Burkard Hillebrands; Alexander A. Serga

doi:10.1063/5.0189154

Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose–Einstein condensate

Matthias R. Schweizer^*, Franziska Kühn, Victor S. L'vov, Anna Pomyalov, Georg von Freymann, Burkard Hillebrands, Alexander A. Serga

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose–Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In the case of a heat-induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose–Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed.

Original language	English
Article number	092402
Journal	Applied Physics Letters
Volume	124
Issue number	9
DOIs	https://doi.org/10.1063/5.0189154
Publication status	Published - 26 Feb 2024

Bibliographical note

This study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), TRR 173-268565370 Spin+X (Project B04). V.S.L. was in part supported by NSF-BSF Grant No. 2020765.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/5.0189154

https://arxiv.org/abs/2311.14476Licence: CC BY

Cite this

@article{6348a2eae7bf43669dff9bfc582bf934,

title = "Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose–Einstein condensate",

abstract = "The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose–Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In the case of a heat-induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose–Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed.",

author = "Schweizer, {Matthias R.} and Franziska K{\"u}hn and L'vov, {Victor S.} and Anna Pomyalov and {von Freymann}, Georg and Burkard Hillebrands and Serga, {Alexander A.}",

note = "This study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), TRR 173-268565370 Spin+X (Project B04). V.S.L. was in part supported by NSF-BSF Grant No. 2020765.",

year = "2024",

month = feb,

day = "26",

doi = "10.1063/5.0189154",

language = "English",

volume = "124",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "9",

}

TY - JOUR

T1 - Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose–Einstein condensate

AU - Schweizer, Matthias R.

AU - Kühn, Franziska

AU - L'vov, Victor S.

AU - Pomyalov, Anna

AU - von Freymann, Georg

AU - Hillebrands, Burkard

AU - Serga, Alexander A.

N1 - This study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), TRR 173-268565370 Spin+X (Project B04). V.S.L. was in part supported by NSF-BSF Grant No. 2020765.

PY - 2024/2/26

Y1 - 2024/2/26

N2 - The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose–Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In the case of a heat-induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose–Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed.

AB - The creation of temperature variations in magnetization, and hence in the frequencies of the magnon spectrum in laser-heated regions of magnetic films, is an important method for studying Bose–Einstein condensation of magnons, magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In the case of a heat-induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose–Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed.

UR - http://www.scopus.com/inward/record.url?scp=85186126597&partnerID=8YFLogxK

U2 - 10.1063/5.0189154

DO - 10.1063/5.0189154

M3 - Article

SN - 0003-6951

VL - 124

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 9

M1 - 092402

ER -

Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose–Einstein condensate

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this