کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9834646 | 1524912 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microscopic model for femtosecond magnetization dynamics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We present a microscopic model that explains quenching of the magnetization of ferromagnetic transition metals such as nickel within a picosecond after laser excitation. Our model describes the interactions between a Fermi sea of (spinless) electrons, an ensemble of two level oscillators representing the phonon system, and a magnetic degree of freedom described by the Weiss model. An Elliot-Yafet type of spin-flip probability αEY is included for each electron-phonon (e-p) scattering event. We show that even though the demagnetization in our model is mediated by phonon scattering, it is possible to obtain a demagnetization time that is shorter than the e-p equilibration (and even thermalization) time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 286, February 2005, Pages 271-275
Journal: Journal of Magnetism and Magnetic Materials - Volume 286, February 2005, Pages 271-275
نویسندگان
B. Koopmans, H.H.J.E. Kicken, M. van Kampen, W.J.M. de Jonge,