Magnon Mode Selective Spin Transport in Compensated Ferrimagnets

Cramer J, Guo EJ, Gepraegs S, Kehlberger A, Ivanov YP, Ganzhorn K, Della Coletta F, Althammer M, Huebl H, Gross R, Kosel J, Klaeui M, Goennenwein STB (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Nano Letters American Chemical Society

Book Volume: 17

Pages Range: 3334-3340

Journal Issue: 6

DOI: 10.1021/acs.nanolett.6b04522

Abstract

We investigate the generation of magnonic thermal spin currents and their mode selective spin transport across interfaces in insulating, compensated ferrimagnet/normal metal bilayer systems. The spin Seebeck effect signal exhibits a nonmonotonic temperature dependence with two sign changes of the detected voltage signals. Using different ferrimagnetic garnets, we demonstrate the universality of the observed complex temperature dependence of the spin Seebeck effect. To understand its origin, we systematically vary the interface between the ferrimagnetic garnet and the metallic layer, and by using different metal layers we establish that interface effects play a dominating role. They do not only modify the magnitude of the spin Seebeck effect signal but in particular also alter its temperature dependence. By varying the temperature, we can select the dominating magnon mode and we analyze our results to reveal the mode selective interface transmission probabilities for different magnon modes and interfaces. The comparison of selected systems reveals semiquantitative details of the interfacial coupling depending on the materials involved, supported by the obtained field dependence of the signal.

Involved external institutions

King Abdullah University of Science and Technology (KAUST) / جامعة الملك عبد الله للعلوم و التقنية SA Saudi Arabia (SA) Bayerische Akademie der Wissenschaften DE Germany (DE) Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE)

How to cite

APA:

Cramer, J., Guo, E.-J., Gepraegs, S., Kehlberger, A., Ivanov, Y.P., Ganzhorn, K.,... Goennenwein, S.T.B. (2017). Magnon Mode Selective Spin Transport in Compensated Ferrimagnets. Nano Letters, 17(6), 3334-3340. https://doi.org/10.1021/acs.nanolett.6b04522

MLA:

Cramer, Joel, et al. "Magnon Mode Selective Spin Transport in Compensated Ferrimagnets." Nano Letters 17.6 (2017): 3334-3340.

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