Photoinduced spin angular momentum transfer into an antiferromagnetic insulator

Static and dynamic magnetic properties of B2 ordered Co2MnAl film epitaxially grown on GaAs

“…We can observe that the damping factor changes drastically from a higher value of 0.12 to a lower nearly constant value of 0.0095 as the magnetic field increases. This field dependence of a eff is mainly due to the dephasing effect as a result of the inhomogeneous anisotropy distribution [23,24]. Moreover, this effect usually becomes significantly larger in the small external field regime [25], which is in accordance with our results.…”

Interface-induced phenomena in magnetism

“…A great advantage of time-resolved techniques over frequency domain techniques is the ability to measure spin precession even for large damping. Spatial resolution requires combining the optical excitation with optical imaging or by using a small optical spot, enabling investigation of how damping of laser-induced precession is affected by interlayer exchange interactions and modified spin-orbit interactions at the interfaces [Engebretson et al ., 2005; Djordjevic et al ., 2006; Weber et al ., 2006; Zhang et al ., 2010; Fan et al ., 2014a]. Analysis of spin precession induced by femtosecond laser excitation was similarly used to reveal a modified spin-orbit interaction and interfacial effects in ferromagnetic exchange-coupled multilayers ( e.g ., [Barman et al ., 2007; Michalski et al ., 2007, Rzhevsky et al ., 2007; Ren et al ., 2008]).…”

Role of antisite disorder on intrinsic Gilbert damping inL10FePt films

“…3(d), the value of α eff gradually decreases with higher H and saturates at high fields [52]. The decreasing trend of α eff with H is attributed to the suppression of dephasing dynamics among magnetic domains [21,31], since multiple domains exist at low fields as indicated in Fig. 1(b) and the magnon-magnon scattering is less effective for perpendicularly magnetized samples [53].…”

“…The uniform magnetization precession can be well modeled with Landau-Lifshitz-GilbertSlonczewski (LLGS) equation [7][8][9], where the Slonczewski torque term denotes the spin transfer torques (STTs), and the Gilbert damping parameter α determines the spin relaxation time [10] and is crucial for device performance [11][12][13][14]. The extrinsic Gilbert damping is due to nonlocal spin relaxation, such as spin pumping and magnon-magnon scattering, which can be tuned by artificial substrates, specially designed buffer and coverage layers [15][16][17][18][19][20][21], while the intrinsic Gilbert damping parameter α 0 is thought to arise from spin-orbit interaction (SOI) [22][23][24][25][26][27][28][29][30], and recently its quadratic dependence on SOI is demonstrated experimentally in FePtPd alloys [31].The α 0 describes the energy flow rate from spin to electronic orbital and phonon degrees of freedom through electron scattering, and has been studied in various theoretical models [22][23][24][25][26][27][28][29][30]. The breathing Fermi surface model [22] and torque-correlation model [23] based on first principle band structure calculations qualitatively match α 0 in soft magnetic alloys such as Fe, .…”