Theory for Tunnel Magnetoresistance Oscillation
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910996846608384 |
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| author | Masuda, Keisuke Scheike, Thomas Sukegawa, Hiroaki Kozuka, Yusuke Mitani, Seiji Miura, Yoshio |
| author_facet | Masuda, Keisuke Scheike, Thomas Sukegawa, Hiroaki Kozuka, Yusuke Mitani, Seiji Miura, Yoshio |
| contents | The universal oscillation of the tunnel magnetoresistance (TMR) ratio as a function of the insulating barrier thickness in crystalline magnetic tunnel junctions (MTJs) is a long-standing unsolved problem in condensed matter physics. To explain this, we here introduce a superposition of wave functions with opposite spins and different Fermi momenta, based on the fact that spin-flip scattering near the interface provides a hybridization between majority- and minority-spin states. In a typical Fe/MgO/Fe MTJ, we solve the tunneling problem and show that the TMR ratio oscillates with a period of $\sim3\,$Å by varying the MgO thickness, consistent with previous and present experimental observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_07919 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Theory for Tunnel Magnetoresistance Oscillation Masuda, Keisuke Scheike, Thomas Sukegawa, Hiroaki Kozuka, Yusuke Mitani, Seiji Miura, Yoshio Materials Science The universal oscillation of the tunnel magnetoresistance (TMR) ratio as a function of the insulating barrier thickness in crystalline magnetic tunnel junctions (MTJs) is a long-standing unsolved problem in condensed matter physics. To explain this, we here introduce a superposition of wave functions with opposite spins and different Fermi momenta, based on the fact that spin-flip scattering near the interface provides a hybridization between majority- and minority-spin states. In a typical Fe/MgO/Fe MTJ, we solve the tunneling problem and show that the TMR ratio oscillates with a period of $\sim3\,$Å by varying the MgO thickness, consistent with previous and present experimental observations. |
| title | Theory for Tunnel Magnetoresistance Oscillation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2406.07919 |