Theory for Tunnel Magnetoresistance Oscillation
| Autor: | Masuda, Keisuke, Scheike, Thomas, Sukegawa, Hiroaki, Kozuka, Yusuke, Mitani, Seiji, Miura, Yoshio |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 $\sim3\,$\r{A} by varying the MgO thickness, consistent with previous and present experimental observations. Comment: 6 pages,4 figures |
| Databáze: | arXiv |
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