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    Magnon Mode Selective Spin Transport in Compensated Ferrimagnets

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    Type
    Article
    Authors
    Cramer, Joel
    Guo, Er-Jia cc
    Geprägs, Stephan
    Kehlberger, Andreas
    Ivanov, Yurii P. cc
    Ganzhorn, Kathrin
    Della Coletta, Francesco
    Althammer, Matthias
    Huebl, Hans
    Gross, Rudolf
    Kosel, Jürgen cc
    Kläui, Mathias
    Goennenwein, Sebastian T. B.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2017-04-13
    Permanent link to this record
    http://hdl.handle.net/10754/625576
    
    Metadata
    Show full item record
    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.
    Citation
    Cramer J, Guo E-J, Geprägs S, Kehlberger A, Ivanov YP, et al. (2017) Magnon Mode Selective Spin Transport in Compensated Ferrimagnets. Nano Letters 17: 3334–3340. Available: http://dx.doi.org/10.1021/acs.nanolett.6b04522.
    Sponsors
    The authors express their gratitude to Professor Gerrit E. W. Bauer and Dr. Joe Barker for valuable discussions and the Institute for Materials Research at Tohoku University for the hospitality during a visiting researcher stay (M.K.). Furthermore, they would like to thank Professor Kathrin Dorr for the help in sample preparation. This work was supported by Deutsche Forschungsgemeinschaft (DFG) SPP 1538 Spin Caloric Transport, the Graduate School of Excellence Materials Science in Mainz (MAINZ, DFG/GSC 266), and the EU projects (IFOX, NMP3-LA-2012246102, INSPIN FP7-ICT-2013-X 612759) and the DAAD (SpinNet and MaHoJeRo during the manuscript preparation). During the manuscript preparation, this work was also partially supported by the U.S. Department of Energy (DOE), Office of Science (OS), Basic Energy Sciences (BES), and by the Laboratory Directed Research and Development (LDRD) Program of Oak Ridge National Laboratory (ORNL) managed by UT-Battelle, LLC, for the U.S. DOE.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.6b04522
    arXiv
    1703.03218
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.6b04522
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.6b04522
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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