Simultaneous laser excitation of backward volume and perpendicular standing spin waves in full-Heusler Co2FeAl0.5Si0.5 films

Abstract

Spin-wave dynamics in full-Heusler Co2FeAl0.5Si0.5 films are studied using all-optical pump-probe magneto-optical polar Kerr spectroscopy. Backward volume magnetostatic spin-wave (BVMSW) mode is observed in films with thickness ranging from 20 to 100 nm besides perpendicular standing spin-wave (PSSW) mode, and found to be excited more efficiently than the PSSW mode. The field dependence of the effective Gilbert damping parameter appears especial extrinsic origin. The relationship between the lifetime and the group velocity of BVMSW mode is revealed. The frequency of BVMSW mode does not obviously depend on the film thickness, but the lifetime and the effective damping appear to do so. The simultaneous excitation of BVMSW and PSSW in Heusler alloy films as well as the characterization of their dynamic behaviors may be of interest for magnonic and spintronic applications.

Optical Excitation of Propagating Magnetostatic Waves in an Epitaxial Galfenol Film by Ultrafast Magnetic Anisotropy Change

“…In particular, it has been demonstrated that femtosecond laser pulses enable excitation of SWs with controlled wavevectors and propagation directions [18,[21][22][23]. However, up to now the effects of short laser pulses employed to drive SWs have been limited to ultrafast opto-magnetic phenomena [18,[21][22][23][24][25], ultrafast demagnetization [17,[26][27][28][29], and coherent energy transfer from elastic waves to the magnon subsystem [24,[30][31][32][33]. These mechanisms place constraints on the properties of the media, the laser pulse parame-ters, and the excitation geometries, while the excitation of propagating SWs by other ultrafast magnetic phenomena [13] remains unexplored.…”

Ultrafast dynamics of 4f electron spins in TbFeCo film driven by inter-atomic 3d–5d–4f exchange coupling

“…As mentioned above, the 800 nm pump pulse can only excite the 3d electrons of FeCo and the 5d electrons of Tb. The demagnetization dynamics are measured in remanence state to avoid the emergence of external-field-driven magnetization precession [17,33] or magnetization reversal across the ferrimagnetic compensation point [3,12]. For RE-TM system, it is demonstrated that the remanence state was stable after excited by controllable amount of pump pulses without helicity [11], and the magnetization dynamics measured in remanence state can represents the temperature-induced change in magnetization [4,12].…”

“…Ultrafast spin dynamics in magnetic system has been an important and active field due to its scientific significance and great potential for developing new magnetic and spintronic technologies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Many researches concentrated on the rare earth (RE) metals [20][21][22][23][24][25], in which the magnetism mainly comes from the localized 4f electrons.…”

Сверхбыстрое Лазерно-Индуцированное Управление Магнитной Анизотропией Наноструктур

“…Эта работа дала толчок для целого ряда исследований СВ, возбуждаемых в различных материалах под действием света. В частности, о применении оптических методик для полностью оптического возбуждения и детектирования магнитостатических СВ в металлах сообщалось для тонких пленок пермаллоя [105][106][107][108][109], CoFeB [110] и сплавов Гейслера [111][112][113]. Механизмом возбуждения при этом являлся процесс сверхбыстрого размагничивания за счет нагрева (см.…”

“…Работа [128] дала толчок к исследованию распространения магнитостатических СВ в металлических пленках [105][106][107][108][109][110][111][112][113]. Однако во всех этих работах возбуждающим механизмом для СВ являлось изменение анизотропии формы при сверхбыстром размагничивании.…”