Spin-orbit enhanced demagnetization rate in Co/Pt-multilayers

Abstract

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Demagnetizing fields in all-optical switching

“…Complete demagnetization is obtained at P inc = 170 mW which, from measurements of reflected and transmitted beam powers, corresponds to P abs = 40 mW . The heat accumulation temperature for this absorbed power gives a Curie temperature T C = 610 K, consistent with results in similar samples of T C = 800 K for Co/Pd [53] and T C = 600 K for Co/Pt [5].…”

“…The antisymmetric part A(τ ) (figure 4) increases and then decreases with power. The time-dependence corresponds to type I UDM [3], with a small demagnetization time τ M , similar to Co and Co/Pt [5], and consistent with measurements of UDM in Co/Pd with XMCD [52], XRMS [20], and X-ray Fourier transform holography [15]. In contrast to previous measurements, heat accumulation temperature T acc is significant and the UDM depth decreases at higher power, as magnetization is gradually removed.…”

Interface-induced phenomena in magnetism

“…Strong modification of dynamics, however, or even novel phenomena can be anticipated due to interfaces between layers or in laterally heterogeneous granular, chemically segregated or patterned systems, which may introduce additional spin-flip scattering. Recent work comparing demagnetization of pure Co films to Co/Pt multilayers shows significant enhancement of spin-flip scattering driven by large orbital moments at the interfaces [Kuiper et al ., 2014]. …”

Element Specificity of Transient Extreme Ultraviolet Magnetic Dichroism

“…In the case of CoPt the dynamics is the results of two processes acting in tandem: (i) OISTR which causes the minority spins to transfer from the Pt to Co (as observed in Refs. [15,16]) and (ii) spin-orbit mediated spin-flips [8,12,[35][36][37] which causes the Pt majority spins to flip into Pt as well as Co minority states leading to a further decrease in the local moment.…”