Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions
| Autor: | Junta Igarashi, Eli Christopher I. Enobio, Shunsuke Fukami, Butsurin Jinnai, Hideo Ohno, Kyota Watanabe |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Magnetization reversal 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Nanomagnet Tunnel magnetoresistance Astroid 0103 physical sciences 0210 nano-technology Anisotropy Scaling Retention time |
| Zdroj: | Applied Physics Letters. 118:082404 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0043058 |
| Popis: | A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δ for data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δ from two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices. |
| Databáze: | OpenAIRE |
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