Precessional damping of Fe magnetic moments in a FeNi film

Abstract

Abstract. We report on the element-resolved precessional dynamics of Fe magnetic moments in a homogeneous FeNi thin film. In our pump-probe experiment the magnetic system is excited by a magnetic field pulse from a stripline. The instantaneous response to the field pulse excitation is monitored as a function of time in a stroboscopic measurement using element selective X-ray Resonant Magnetic Scattering (XRMS). Our data show that Fe and Ni moments are aligned parallel to each other at all times, while they oscillate around the effective field direction given by the step field pulse and applied bias field. The field dependence of the precessional motion and damping of Fe magnetic moments is analyzed and compared to time-resolved Magneto-Optical Kerr Effect (tr-MOKE) measurement data from literature, showing good agreement. Additional studies proove the capability of our setup to conduct temperature dependent studies. In case of the presented FeNi system no changes in the frequency or damping behavior are observed within a temperature range of 150 − 350 K.

Two-magnon scattering by domain wall induced coupling in Co2MnGe/Au/Py layer systems

“…Circularly polarized X‐ray beam was tuned to the Fe resonance edge (708 eV). With this method, the transverse component of magnetization dynamics in ferromagnetic layers induced by step‐field pulse excitation is recorded as a function of time . The time resolution is achieved through magnetic field pump –X‐ray probe techniques, utilizing magnetic field pulses that are synchronized with a variable delay time with respect to the X‐ray photon bunches.…”

“…The 50 nm thick Au buffer layers were used as conductors for the current pulses. A schematic view and further details of our experimental setup are described in our previous studies .…”

Reinventing atomistic magnetic simulations with spin-orbit coupling

“…The stability of our model over such a range of coefficients promotes its applicability to a wide class of systems with varying SO coupling strengths. If the interest lies in obtaining realistic relaxation times for the material under investigation, one can tune C 1 and C 2 appropriately in accordance with the spin relaxation data obtained through pump-probe experiments 44 . So far, our discussion on induced anistoropies was centered on lattice vibrations as the primary source of symmetry breaking in the local environment.…”

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

“…87 The ability of TR-XRMS to probe element specific free precessional magnetization dynamics allows studies of artificially prepared complex structures with more than one magnetic material. We have studied the free precessional dynamics of the Fe magnetic moments in Ni 81 Fe 19 alloy films (Py), 75 in spin valve type trilayers such as Co/Cu/Py, Co 2 MnGe/V/Py and Co 2 MnGe/Au/Py, 77,78,88 or Py/Cu and Py/AlO multilayer structures. 76 An interesting effect has been found by studying magnetization precessional dynamics of Py layers in the Co/Cu/Py spin valves having two different configurations of mutual orientation of magnetization in Py and Co layers: parallel (P) and antiparallel (AP).…”

“…Another transient state can be excited that changes the direction of the magnetization after field pulse excitation, followed by a damped precessional motion about the new field direction. [74][75][76][77][78] Implementation of time-resolved XRMS (TR-XRMS) for probing the transverse magnetization dynamics has the advantages of being element specific and sensitive to layer thickness and interfaces, which is particularly advantageous for investigations of magnetic heterostructures. It should also be mentioned that similar methods have been developed for studying the magnetization dynamics on the picosecond time scale, including the use of microwave excitations phase-locked with photon bunch frequency.…”