Continuous Neel to Bloch Transition as Thickness Increases: Statics and Dynamics
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2008
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| _version_ | 1866917380992532480 |
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| author | Rivkin, Kirill Romanov, Konstantin Adamov, Yury Abanov, Artem Pokrovsky, Valery Saslow, Wayne |
| author_facet | Rivkin, Kirill Romanov, Konstantin Adamov, Yury Abanov, Artem Pokrovsky, Valery Saslow, Wayne |
| contents | We analyze the properties of Neel and Bloch domain walls as a function of film thickness h, for systems where, in addition to exchange, the dipole-dipole interaction must be included. The Neel to Bloch phase transition is found to be a second order transition at hc, mediated by a single unstable mode that corresponds to oscillatory motion of the domain wall center. A uniform out-of-plane rf-field couples strongly to this critical mode only in the Neel phase. An analytical Landau theory shows that the critical mode frequency varies as the square root of (hc - h) just below the transition, as found numerically. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_0801_0583 |
| institution | arXiv |
| publishDate | 2008 |
| record_format | arxiv |
| spellingShingle | Continuous Neel to Bloch Transition as Thickness Increases: Statics and Dynamics Rivkin, Kirill Romanov, Konstantin Adamov, Yury Abanov, Artem Pokrovsky, Valery Saslow, Wayne Statistical Mechanics Materials Science We analyze the properties of Neel and Bloch domain walls as a function of film thickness h, for systems where, in addition to exchange, the dipole-dipole interaction must be included. The Neel to Bloch phase transition is found to be a second order transition at hc, mediated by a single unstable mode that corresponds to oscillatory motion of the domain wall center. A uniform out-of-plane rf-field couples strongly to this critical mode only in the Neel phase. An analytical Landau theory shows that the critical mode frequency varies as the square root of (hc - h) just below the transition, as found numerically. |
| title | Continuous Neel to Bloch Transition as Thickness Increases: Statics and Dynamics |
| topic | Statistical Mechanics Materials Science |
| url | https://arxiv.org/abs/0801.0583 |