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- W2323085318 abstract "The write field requirements in heat-assisted magnetic recording (HAMR) using FePt media are studied using an atomistic model. Langevin dynamics simulations of laser-induced thermal demagnetization and magnetization recovery are performed on a single L1 <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>o</sub> -ordered FePt grain. We show that the minimum heat temperature for thermal overwrite of information is a cooling ratedependent temperature T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>o</sub> , larger than the Curie temperature of the grains. If T <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>o</sub> is exceeded, memory effects can be neglected in HAMR since the characteristic pulse time is long compared with the mean first passage time of thermal demagnetization. The minimum write field H <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>w</sub> to attain sufficiently high thermoremanence M <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>Z</sub> = 0.9MS is then independent of the heating process. We study the variation of H <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>w</sub> with cooling rate, damping, field orientation, and grain size L, and explore the phase space of the parameters H, T, and L, also resulting in thermal stability of the recorded information during storage." @default.
- W2323085318 created "2016-06-24" @default.
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- W2323085318 date "2014-11-01" @default.
- W2323085318 modified "2023-10-18" @default.
- W2323085318 title "Memory Erasure and Write Field Requirements in HAMR Using L<inline-formula> <tex-math notation=TeX>(1_mathbf {o}) </tex-math></inline-formula>-FePt Nanoparticles" @default.
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- W2323085318 doi "https://doi.org/10.1109/tmag.2014.2323171" @default.
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