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Schreier, M. (author), Kamra, A. (author), Weiler, M. (author), Xiao, J. (author), Bauer, G.E.W. (author), Gross, R. (author), Goennenwein, S.T.B. (author)
We calculate the phonon, electron, and magnon temperature profiles in yttrium iron garnet/platinum bilayers by diffusive theory with appropriate boundary conditions, in particular taking into account interfacial thermal resistances. Our calculations show that in thin film hybrids, the interface magnetic heat conductance qualitatively affects the...
journal article 2013
document
Yan, P. (author), Kamra, A. (author), Cao, Y. (author), Bauer, G.E.W. (author)
The angular momentum vector of a Heisenberg ferromagnet with isotropic exchange interaction is conserved, while under uniaxial crystalline anisotropy the projection of the total spin along the easy axis is a constant of motion. Using Noether's theorem, we prove that these conservation laws persist in the presence of dipole-dipole interactions....
journal article 2013
document
Weiler, M. (author), Althammer, M. (author), Schreier, M. (author), Lotze, J. (author), Pernpeintner, M. (author), Meyer, S. (author), Huebl, H. (author), Gross, R. (author), Kamra, A. (author), Xiao, J. (author), Chen, Y.T. (author), Jiao, H.J. (author), Bauer, G.E.W. (author), Goennenwein, S.T.B. (author)
We perform a quantitative, comparative study of the spin pumping, spin Seebeck, and spin Hall magnetoresistance effects, all detected via the inverse spin Hall effect in a series of over 20??yttrium???iron?garnet/Pt samples. Our experimental results fully support present, exclusively spin current-based, theoretical models using a single set of...
journal article 2013
document
Kamra, A. (author), Witek, F.P. (author), Meyer, S. (author), Huebl, H. (author), Geprägs, S. (author), Gross, R. (author), Bauer, G.E.W. (author), Goennenwein, S.T.B. (author)
We measure the low-frequency thermal fluctuations of pure spin current in a platinum film deposited on yttrium iron garnet via the inverse spin Hall effect (ISHE)-mediated voltage noise as a function of the angle ? between the magnetization and the transport direction. The results are consistent with the fluctuation-dissipation theorem in terms...
journal article 2014
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Kamra, A. (author), Keshtgar, H. (author), Yan, P. (author), Bauer, G.E.W. (author)
We model the injection of elastic waves into a ferromagnetic film (F) by a nonmagnetic transducer (N). We compare the configurations in which the magnetization is normal and parallel to the wave propagation. The lack of axial symmetry in the former results in the emergence of evanescent interface states. We compute the energy-flux transmission...
journal article 2015
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Geprägs, S. (author), Kehlberger, A. (author), Coletta, F.D. (author), Qiu, Z. (author), Guo, E.J. (author), Schulz, T. (author), Mix, C. (author), Meyer, S. (author), Kamra, A. (author), Althammer, M. (author), Huebl, H. (author), Jakob, G. (author), Ohnuma, Y. (author), Adachi, H. (author), Barker, J. (author), Maekawa, S. (author), Bauer, G.E.W. (author), Saitoh, E. (author), Gross, R. (author), Goennenwein, S.T.B. (author), Kläui, M. (author)
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...
journal article 2016
document
Keshtgar, H. (author), Streib, S.D. (author), Kamra, Akashdeep (author), Blanter, Y.M. (author), Bauer, G.E. (author)
We address the theory of the coupled lattice and magnetization dynamics of freely suspended single-domain nanoparticles. Magnetic anisotropy generates low-frequency satellite peaks in the microwave absorption spectrum and a blueshift of the ferromagnetic resonance (FMR) frequency. The low-frequency resonances are very sharp with maxima...
journal article 2017
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