Spinmotive Force Due to Intrinsic Energy of Ferromagnetic Nanowires
We study, both analytically and numerically, a spinmotive force arising from the inherent magnetic energy of a domain wall in a wedged ferromagnetic nanowire. In a spatially-nonuniform nanowire, domain walls are subjected to an effective magnetic field, resulting in spontaneous motion of the walls....
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| Published in | Applied physics express Vol. 4; no. 9; pp. 093003 - 093003-3 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
The Japan Society of Applied Physics
01.09.2011
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| Online Access | Get full text |
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| Summary: | We study, both analytically and numerically, a spinmotive force arising from the inherent magnetic energy of a domain wall in a wedged ferromagnetic nanowire. In a spatially-nonuniform nanowire, domain walls are subjected to an effective magnetic field, resulting in spontaneous motion of the walls. The spinmotive force mechanism converts the ferromagnetic exchange and demagnetizing energy of the nanowire into the electrical energy of the conduction electrons through the domain wall motion. The calculations show that this spinmotive force can be several microvolts, which is easily detectable by experiments. |
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| Bibliography: | (a) Schematic illustration of a Ni 81 Fe 19 wedged nanowire containing a single DW. The arrows indicate the magnetization direction $\mbi{m}$. The DW is characterized by two collective coordinates, i.e., $q$, the center position, and $\psi$, the tilt angle from the easy plane. (b) The spinmotive force and the shape-effect magnetic field, calculated using eqs. ( ), ( ), ( ), and ( ), with $H=0$, as a function of the DW position $q$. The inset describes the dimensions of the sample. Time evolution of (a) the spatially-averaged $z$-component of the magnetizations $\langle m_{z}\rangle$ (the inset shows a magnified image) with the five snapshots of the distribution of $m_{z}$ corresponding to the time indicated by the arrows, (b) the applied magnetic field, and (c) the spinmotive force between the ends of the nanowire. |
| ISSN: | 1882-0778 1882-0786 |
| DOI: | 10.1143/APEX.4.093003 |