In the field of spintronics, ferromagnetic/nonmagnetic metallic multilayers are core building blocks for emerging technologies. Resonance experiments using stripline transducers are commonly used to characterize and engineer these stacks for applications. Up to now in these experiments, the influence of eddy currents on the excitation of the dynamics of ferromagnetic magnetization below the skin-depth limit was most often neglected. Here, using a coplanar stripline transducer, we experimentally investigated the broadband ferromagnetic resonance response of NiFe/Cu bilayers a few nanometers thick in the sub-skin-depth regime. Asymmetry in the absorption spectrum gradually built up as the excitation frequency and Cu-layer thickness increased. Most significantly, the sign of the asymmetry depended on the stacking order. Experimental data were consistent with a quantitative analysis considering the eddy currents generated in the Cu layers and the subsequent phase shift of the feedback magnetic field generated by the eddy currents. These results extend our understanding of the impact of eddy currents below the microwave magnetic skin-depth and explain the line shape asymmetry and phase lags reported in stripline experiments.
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15 July 2019
Research Article|
July 18 2019
Stacking order-dependent sign-change of microwave phase due to eddy currents in nanometer-scale NiFe/Cu heterostructures
O. Gladii;
O. Gladii
a)
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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R. L. Seeger;
R. L. Seeger
a)
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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L. Frangou;
L. Frangou
a)
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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G. Forestier;
G. Forestier
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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U. Ebels;
U. Ebels
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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S. Auffret;
S. Auffret
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
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O. Gladii
a)
R. L. Seeger
a)
L. Frangou
a)
G. Forestier
U. Ebels
S. Auffret
V. Baltz
b)
Univ. Grenoble Alpes, CNRS
, CEA
, Grenoble INP, IRIG-SPINTEC
, F-38000 Grenoble, France
a)
Contributions: O. Gladii, R. L. Seeger, and L. Frangou contributed equally to this work.
Appl. Phys. Lett. 115, 032403 (2019)
Article history
Received:
February 18 2019
Accepted:
June 25 2019
Citation
O. Gladii, R. L. Seeger, L. Frangou, G. Forestier, U. Ebels, S. Auffret, V. Baltz; Stacking order-dependent sign-change of microwave phase due to eddy currents in nanometer-scale NiFe/Cu heterostructures. Appl. Phys. Lett. 15 July 2019; 115 (3): 032403. https://doi.org/10.1063/1.5093150
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