Role of Entropy in Domain Wall Motion in Thermal Gradients

Schlickeiser, Frank; Ritzmann, Ulrike; Hinzke, Denise; Nowak, Ulrich

Role of Entropy in Domain Wall Motion in Thermal Gradients

Dateien

Schlickeiser_0-259105.pdfGröße: 253.91 KBDownloads: 517

Datum

2014

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review Letters. 2014, 113(9), 097201. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.113.097201

Zusammenfassung

Thermally driven domain wall (DW) motion caused solely by magnonic spin currents was forecast theoretically and has been measured recently in a magnetic insulator using magneto-optical Kerr effect microscopy. We present an analytical calculation of the DW velocity as well as the Walker breakdown within the framework of the Landau Lifshitz Bloch equation of motion. The temperature gradient leads to a torque term acting on the magnetization where the DW is mainly driven by the temperature dependence of the exchange stiffness, or—in a more general picture—by the maximization of entropy. The existence of this entropic torque term does not rest on the angular momentum transfer from the magnonic spin current. Hence, even DWs in antiferromagnets or compensated ferrimagnets should move accordingly. We further argue that the entropic torque exceeds that of the magnonic spin current.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

SCHLICKEISER, Frank, Ulrike RITZMANN, Denise HINZKE, Ulrich NOWAK, 2014. Role of Entropy in Domain Wall Motion in Thermal Gradients. In: Physical Review Letters. 2014, 113(9), 097201. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.113.097201

BibTex

@article{Schlickeiser2014Entro-29350,
  year={2014},
  doi={10.1103/PhysRevLett.113.097201},
  title={Role of Entropy in Domain Wall Motion in Thermal Gradients},
  number={9},
  volume={113},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Schlickeiser, Frank and Ritzmann, Ulrike and Hinzke, Denise and Nowak, Ulrich},
  note={Article Number: 097201}
}

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