KOPS - The Institutional Repository of the University of Konstanz

Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents : competition of angular momentum transfer and entropic torque

Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents : competition of angular momentum transfer and entropic torque

Cite This

Files in this item

Checksum: MD5:4eae8142982d4b65c8746b2ae86c40ab

DONGES, Andreas, Niklas GRIMM, Florian JAKOBS, Severin SELZER, Ulrike RITZMANN, Unai ATXITIA, Ulrich NOWAK, 2019. Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents : competition of angular momentum transfer and entropic torque. In: Physical Review Research. American Physical Society (APS). 2(1), 013293. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.2.013293

@article{Donges2019-11-13T10:51:37ZUnvei-51065, title={Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents : competition of angular momentum transfer and entropic torque}, year={2019}, doi={10.1103/PhysRevResearch.2.013293}, number={1}, volume={2}, journal={Physical Review Research}, author={Donges, Andreas and Grimm, Niklas and Jakobs, Florian and Selzer, Severin and Ritzmann, Ulrike and Atxitia, Unai and Nowak, Ulrich}, note={Article Number: 013293} }

<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/51065"> <dc:creator>Donges, Andreas</dc:creator> <dcterms:abstract xml:lang="eng">Control of magnetic domain wall motion holds promise for efficient manipulation and transfer of magnetically stored information. Thermal magnon currents, generated by temperature gradients, can be used to move magnetic textures, from domain walls to magnetic vortices and skyrmions. In the past several years, theoretical studies have focused on ferro- and antiferromagnetic spin structures, where domain walls always move toward the hotter end of the thermal gradient. Here we perform numerical studies using atomistic spin dynamics simulations and complementary analytical calculations to derive an equation of motion for the domain wall velocity in ferrimagnets. We demonstrate that in ferrimagnets, domain wall motion under thermal magnon currents shows a much richer dynamics. Below the Walker breakdown, we find that the temperature gradient always pulls the domain wall toward the hot end by minimizing its free energy, in agreement with the observations for ferro- and antiferromagnets in the same regime. Above Walker breakdown, the ferrimagnetic domain wall can show the opposite, counterintuitive behavior of moving toward the cold end. We show that in this case, the motion to the hotter or the colder ends is driven by angular momentum transfer and therefore strongly related to the angular momentum compensation temperature, a unique property of ferrimagnets where the intrinsic angular momentum of the ferrimagnet is zero while the sublattice angular momentum remains finite. In particular, we find that below the compensation temperature the wall moves toward the cold end, whereas above it toward the hot end. Moreover, we find that for ferrimagnets, there is a torque compensation temperature at which the domain wall dynamics shows similar characteristics to antiferromagnets, that is, quasi-inertia-free motion and the absence of Walker breakdown. This finding opens the door for fast control of magnetic domains as given by the antiferromagnetic character while conserving the advantage of ferromagnets in terms of measuring and control by conventional means such as magnetic fields.</dcterms:abstract> <dc:contributor>Ritzmann, Ulrike</dc:contributor> <dc:creator>Ritzmann, Ulrike</dc:creator> <dc:contributor>Grimm, Niklas</dc:contributor> <dc:contributor>Atxitia, Unai</dc:contributor> <dc:language>eng</dc:language> <dc:rights>Attribution 4.0 International</dc:rights> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <dc:contributor>Selzer, Severin</dc:contributor> <dc:contributor>Nowak, Ulrich</dc:contributor> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/51065/1/Donges_2-1av9cz4ld1hu92.pdf"/> <bibo:uri rdf:resource="https://kops.uni-konstanz.de/handle/123456789/51065"/> <dc:contributor>Jakobs, Florian</dc:contributor> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2020-09-28T14:12:13Z</dcterms:available> <dc:creator>Jakobs, Florian</dc:creator> <dcterms:issued>2019-11-13T10:51:37Z</dcterms:issued> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <dc:creator>Nowak, Ulrich</dc:creator> <dcterms:rights rdf:resource="http://creativecommons.org/licenses/by/4.0/"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2020-09-28T14:12:13Z</dc:date> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dc:creator>Selzer, Severin</dc:creator> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Donges, Andreas</dc:contributor> <dcterms:title>Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents : competition of angular momentum transfer and entropic torque</dcterms:title> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/51065/1/Donges_2-1av9cz4ld1hu92.pdf"/> <dc:creator>Grimm, Niklas</dc:creator> <dc:creator>Atxitia, Unai</dc:creator> </rdf:Description> </rdf:RDF>

Downloads since Sep 28, 2020 (Information about access statistics)

Donges_2-1av9cz4ld1hu92.pdf 97

This item appears in the following Collection(s)

Attribution 4.0 International Except where otherwise noted, this item's license is described as Attribution 4.0 International

Search KOPS


Browse

My Account