6533b81ffe1ef96bd127709f
RESEARCH PRODUCT
Origin of the spin Seebeck effect in compensated ferrimagnets
Mathias KläuiStephan GeprägsEiji SaitohMatthias AlthammerZhiyong QiuFrancesco Della ColettaSibylle MeyerEr-jia GuoSadamichi MaekawaGerhard JakobJoseph BarkerYuichi OhnumaYuichi OhnumaT. SchulzChristian MixAndreas KehlbergerHiroto AdachiRudolf GrossRudolf GrossAkashdeep KamraAkashdeep KamraGerrit E. W. BauerGerrit E. W. BauerHans HueblSebastian T. B. Goennenweinsubject
GadoliniumScienceGeneral Physics and Astronomychemistry.chemical_elementNanotechnology02 engineering and technology01 natural sciencesGeneral Biochemistry Genetics and Molecular BiologyArticleCondensed Matter::Materials Sciencephysical sciencesFerrimagnetism0103 physical sciencesThermoelectric effectddc:530010306 general physicsSpin-½PhysicsMultidisciplinarycondensed matterCondensed matter physicsMagnonQGeneral Chemistry021001 nanoscience & nanotechnology3. Good healthFerromagnetismchemistryExcited stateSpin Hall effectCondensed Matter::Strongly Correlated Electrons0210 nano-technologydescription
Magnons are the elementary excitations of a magnetically ordered system. In ferromagnets, only a single band of low-energy magnons needs to be considered, but in ferrimagnets the situation is more complex owing to different magnetic sublattices involved. In this case, low lying optical modes exist that can affect the dynamical response. Here we show that the spin Seebeck effect (SSE) is sensitive to the complexities of the magnon spectrum. The SSE is caused by thermally excited spin dynamics that are converted to a voltage by the inverse spin Hall effect at the interface to a heavy metal contact. By investigating the temperature dependence of the SSE in the ferrimagnet gadolinium iron garnet, with a magnetic compensation point near room temperature, we demonstrate that higher-energy exchange magnons play a key role in the SSE.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-02-04 | Nature Communications |