Enhanced gilbert damping in thin ferromagnetic films.
نویسندگان
چکیده
The precession of the magnetization of a ferromagnet is shown to transfer spins into adjacent normal metal layers. This "pumping" of spins slows down the precession corresponding to an enhanced Gilbert damping constant in the Landau-Lifshitz equation. The damping is expressed in terms of the scattering matrix of the ferromagnetic layer, which is accessible to model and first-principles calculations. Our estimates for permalloy thin films explain the trends observed in recent experiments.
منابع مشابه
Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films
The Gilbert damping of ferromagnetic materials is arguably the most important but least understood phenomenological parameter that dictates real-time magnetization dynamics. Understanding the physical origin of the Gilbert damping is highly relevant to developing future fast switching spintronics devices such as magnetic sensors and magnetic random access memory. Here, we report an experimental...
متن کاملGilbert damping in magnetic layered systems
The Gilbert damping constant present in the phenomenological Landau-Lifshitz-Gilbert equation describing the dynamics of magnetization is calculated for ferromagnetic metallic films as well as Co/nonmagnet (NM) bilayers. The calculations are done within a realistic nine-orbital tight-binding model including spin-orbit coupling. The convergence of the damping constant expressed as a sum over the...
متن کاملFerromagnetic resonance linewidth in thin films coupled to NiO
The out-of-plane angular dependence of the ferromagnetic resonance linewidth, ∆H, has been measured for thin magnetic films coupled to NiO and for uncoupled control films. In the control films, ∆H is described by nearly angle-independent damping parameters. In the NiO-coupled films, however, the damping was found to depend strongly on magnetization orientation, with linewidth values comparable ...
متن کاملGilbert ferromagnetic damping theory and the fluctuation-dissipation theorem
Related Articles Evolution of ferromagnetic and spin-wave resonances with crystalline order in thin films of full-Heusler alloy Co2MnSi J. Appl. Phys. 111, 023912 (2012) Frequency-selective control of ferromagnetic resonance linewidth in magnetic multilayers Appl. Phys. Lett. 100, 032402 (2012) Spin wave modes in ferromagnetic tubes J. Appl. Phys. 111, 013905 (2012) Hysteretic spin-wave excitat...
متن کاملOptical Characterization of Ferromagnetic and Multiferroic Thin-Film Heterostructures
This thesis presents optical characterization of the static and dynamic magnetic interactions in ferromagnetic and multiferroic heterostructures with time-resolved and interface-specific optical techniques. The focus of the thesis is on elucidating the underlying physics of key physical parameters and novel approaches, crucial to the performance of magnetic recording and spintronic devices. Fir...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 88 11 شماره
صفحات -
تاریخ انتشار 2002