Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation
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arXiv
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| Format: | Preprint |
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2024
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| author | Noël, Paul Karadža, Emir Schlitz, Richard Welter, Pol Lambert, Charles-Henri Nessi, Luca Binda, Federico Degen, Christian L. Gambardella, Pietro |
| author_facet | Noël, Paul Karadža, Emir Schlitz, Richard Welter, Pol Lambert, Charles-Henri Nessi, Luca Binda, Federico Degen, Christian L. Gambardella, Pietro |
| contents | We present a comprehensive set of harmonic resistance measurements of the dampinglike (DL) and fieldlike (FL) torques in Pt/CoFeB, Pt/Co, W/CoFeB, W/Co, and YIG/Pt bilayers complemented by measurements of the DL torque using the magneto-optical Kerr effect and calibrated by nitrogen vacancy magnetometry on the same devices. The magnon creation-annihilation magnetoresistances depend strongly on temperature and on the magnetic and transport properties of each bilayer, affecting the estimate of both the DL and FL torque. The DL torque, the most important parameter for applications, is overestimated by a factor of 2 in W/CoFeB and by one order of magnitude in YIG/Pt when not accounting for the magnonic contribution to the planar Hall resistance. We further show that the magnonic contribution can be quantified by combining measurements of the nonlinear longitudinal and transverse magnetoresistances, thus providing a reliable method to measure the spin-orbit torques in different material systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_07999 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation Noël, Paul Karadža, Emir Schlitz, Richard Welter, Pol Lambert, Charles-Henri Nessi, Luca Binda, Federico Degen, Christian L. Gambardella, Pietro Mesoscale and Nanoscale Physics Materials Science We present a comprehensive set of harmonic resistance measurements of the dampinglike (DL) and fieldlike (FL) torques in Pt/CoFeB, Pt/Co, W/CoFeB, W/Co, and YIG/Pt bilayers complemented by measurements of the DL torque using the magneto-optical Kerr effect and calibrated by nitrogen vacancy magnetometry on the same devices. The magnon creation-annihilation magnetoresistances depend strongly on temperature and on the magnetic and transport properties of each bilayer, affecting the estimate of both the DL and FL torque. The DL torque, the most important parameter for applications, is overestimated by a factor of 2 in W/CoFeB and by one order of magnitude in YIG/Pt when not accounting for the magnonic contribution to the planar Hall resistance. We further show that the magnonic contribution can be quantified by combining measurements of the nonlinear longitudinal and transverse magnetoresistances, thus providing a reliable method to measure the spin-orbit torques in different material systems. |
| title | Estimation of spin-orbit torques in the presence of current-induced magnon creation and annihilation |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2411.07999 |