Strong Spin Pumping in Permalloy-Iridium Heterostructures

We report a study of spin pumping in Permalloy/iridium (Py/Ir) and Py/Cu/Ir heterostructures as a function of Ir thickness. Ir is shown to be a strong spin sink, leading to enhancements of the Gilbert damping parameter of 50% and 170% with and without the Cu interlayer, respectively. Our results are consistent with strong spin-memory loss at the interface with Ir. The thickness dependence of the damping parameter in Py/Ir is exponential in nature, suggesting that no magnetic proximity effect exists. The combination of a strong spin-mixing conductance without magnetic proximity effect may make Ir a strong candidate for studies and devices related to spin Hall effects.

[1]  M. Belmeguenai,et al.  Damping and spin mixing conductance in Ni80Fe20/CuIr structures: effect of Ir doping , 2017 .

[2]  Burkard Hillebrands,et al.  Study of fully epitaxial Fe/Pt bilayers for spin pumping by ferromagnetic resonance spectroscopy , 2016 .

[3]  M. Shiraishi,et al.  Conversion of spin current into charge current in Bi 0.85 Sb 0.15 , 2016 .

[4]  Simranjeet Singh,et al.  Moderate Positive Spin Hall Angle in Uranium , 2015, 1512.04903.

[5]  J. Bass.  CPP magnetoresistance of magnetic multilayers: A critical review , 2015, 1511.07387.

[6]  B. Kirby,et al.  Spatial Evolution of the Ferromagnetic Phase Transition in an Exchange Graded Film. , 2015, Physical review letters.

[7]  Anna Delin,et al.  Tunable permalloy-based films for magnonic devices , 2015 .

[8]  John G. Jones,et al.  Comparison of spin-orbit torques and spin pumping across NiFe/Pt and NiFe/Cu/Pt interfaces , 2015, 1503.04104.

[9]  J. Pearson,et al.  Spin pumping and inverse spin Hall effects—Insights for future spin-orbitronics (invited) , 2015 .

[10]  T. Silva,et al.  Resolving the controversy of a possible relationship between perpendicular magnetic anisotropy and the magnetic damping parameter , 2014 .

[11]  T. Silva,et al.  Precise determination of the spectroscopic g-factor using broadband ferromagnetic resonance spectroscopy | NIST , 2013 .

[12]  H. Jaffrès,et al.  Spin pumping and inverse spin Hall effect in platinum: the essential role of spin-memory loss at metallic interfaces. , 2013, Physical review letters.

[13]  Hyunsoo Yang,et al.  Role of spin mixing conductance in spin pumping: Enhancement of spin pumping efficiency in Ta/Cu/Py structures , 2013, 1311.6098.

[14]  T. Silva,et al.  Precise determination of the spectroscopic g-factor by use of broadband ferromagnetic resonance spectroscopya) , 2013, 1310.7515.

[15]  Michael Kabatek,et al.  Damping in yttrium iron garnet nanoscale films capped by platinum. , 2013, Physical review letters.

[16]  W. E. Bailey,et al.  Effect of direct exchange on spin current scattering in Pd and Pt , 2013, 1308.0450.

[17]  F. Y. Yang,et al.  Scaling of spin Hall angle in 3d, 4d, and 5d metals from Y3Fe5O12/metal spin pumping. , 2013, Physical review letters.

[18]  A. Hoffmann.  Spin Hall Effects in Metals , 2013, IEEE Transactions on Magnetics.

[19]  E. Augendre,et al.  Spin pumping and inverse spin Hall effect in germanium , 2013, 1305.2602.

[20]  L Sun,et al.  Pt magnetic polarization on Y3Fe5O12 and magnetotransport characteristics. , 2013, Physical review letters.

[21]  V. Zagorodnii,et al.  A broadband ferromagnetic resonance spectrometer to measure thin films up to 70 GHz. , 2011, The Review of scientific instruments.

[22]  A. Fert,et al.  Extrinsic spin Hall effect induced by iridium impurities in copper. , 2011, Physical review letters.

[23]  R. McMichael.  A mean-field model of extrinsic line broadening in ferromagnetic resonance , 2008 .

[24]  M. Naito,et al.  Intrinsic spin Hall effect and orbital Hall effect in 4 d and 5 d transition metals , 2007, 0711.1263.

[25]  W. Pratt,et al.  Spin-diffusion lengths in metals and alloys, and spin-flipping at metal/metal interfaces: an experimentalist’s critical review , 2006, cond-mat/0610085.

[26]  Eiji Saitoh,et al.  Conversion of spin current into charge current at room temperature: Inverse spin-Hall effect , 2006 .

[27]  G. Woltersdorf.  Spin-Pumping and Two-magnonScattering in Magnetic Multilayers , 2004 .

[28]  R. McMichael,et al.  Thin Al, Au, Cu, Ni, Fe, and Ta films as oxidation barriers for Co in air , 2003 .

[29]  A. Brataas,et al.  Enhanced gilbert damping in thin ferromagnetic films. , 2001, Physical review letters.

[30]  White,et al.  Precise determination of , 1986, Physical review letters.

[31]  J. V. Vleck.  Concerning the Theory of Ferromagnetic Resonance Absorption , 1950 .

[32]  C. Kittel.  Interpretation of Anomalous Larmor Frequencies in Ferromagnetic Resonance Experiment , 1947 .