| Autor: |
Uesaka, Yasutaro, Suzuki, Yoshio, Kitakami, Osamu, Nakatani, Yoshinobu, Hayashi, Nobuo, Fukushima, Hiroshi |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Jun2012, Vol. 111 Issue 12, p123907, 5p |
| Abstrakt: |
We studied the switching time of a single spin in a field varying linearly in time using a micromagnetics simulation based on the Landau-Lifshitz-Gilbert equation. The applied field larger than the switching field or coercivity is not enough for a spin to switch but some duration of time is also necessary. We found that the value of C1 defined by C1=∫(H-H1)dt was constant when the rate of change in the field was larger than 10 × γHk2, where γ is the gyromagnetic ratio with g value = 2, H is the applied field, H1 is a constant, and Hk is the anisotropy field of the spin. The integration is taken from the time the spin begins switching to the switching time. The equation is a generalized form of the equation, C0=(H-H0)τsw, in a constant field H. Here, C0 and H0 are constants, and τsw is the switching time. We found that C1 in the region dH/dt>10×γHK2 and C0 in the region H>HK are the same, but that H1 does not coincide with H0. We found that the head field rise time has a very small effect on the switching field and time of recording media. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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