Real-space observation of magnetic vortex core gyration in a magnetic disc both with and without a pair tag

Abstract

We demonstrate the time-resolved real-space observation of vortex gyration in a magnetic circular disc by X-ray magnetic circular dichroism photoemission microscopy at the SPring-8 beamline BL25SU, both with and without an additional structure called a pair tag, which serves to control the magnetic curling direction. By comparing the gyration orbits of the vortices, we found that the gyration properties are dependent on the presence of the additional structure in spite of the discs having the same diameter. Furthermore, we reproduced the vortex gyration by micromagnetic simulation. The confinement potential of the vortex can be controlled by the additional structure.

Magnetic Scattering in Ni Wires Fabricated on Ferroelectric LiNbO3 Substrate for Magnetic Sensor Application

“…In our previous study using XMCD-PEEM at the BL17SU and BL25SU beamlines of SPring-8, (23)(24)(25) the stripe domain and single-domain structures can be formed in the micrometer-scale Ni wires aligned perpendicular and parallel to the OF direction of the LiNbO 3 substrate, respectively. To investigate the magnetization reversal process, we measured the MR. Figure 3 shows the typical resistivity measurement results of the 700-nm-wide Ni wire when the magnetic fields were applied parallel and perpendicular to the longitudinal axis of the wire.…”

“…The exchange bias and magnetostriction also offer key techniques to control the magnetic domain structure and its reversal characteristics. (15)(16)(17)(18)(19)(20)(21)(22) The magnetization dynamics in these systems have been studied by various techniques including time-resolved X-ray magnetic circular dichroism-photoemission electron microscopy (XMCD-PEEM), (23)(24)(25) Kerr microscopy, (26,27) Brillouin light scattering (BLS), (28,29) and electrical detection techniques. (3,5,13,22,(30)(31)(32)(33)(34) Recently, attempts to fabricate artificial multiferroic materials with their functionalities above room temperature have been focused on because the control of magnetic domain structures and their magnetization dynamics using electric fields or strain that is electrically induced through the piezoelectric effect has the potential to decrease the power consumption of devices from the viewpoint of constituent materials.…”

Observation of frequency dependent resonances in magnetic vortex core gyration using time-resolved magneto-optical Kerr microscope with pulsed semiconductor laser illumination

“…[19][20][21][22] This suggests that it is difficult to observe the resonance under the condition that the magnetic field frequency is fixed and the size of the structure is varied. 10) This result shows the advantage of the present method, which can be measured at any frequency.…”

“…[1][2][3] This motion can be excited by the application of an ac magnetic field, and has been the subject of observation in various time-resolved magnetic imaging techniques. [4][5][6][7][8][9][10] In these studies, the samples were designed and fabricated to match the repetition rate of the light source of the measurement system.…”

Study on relatively large response of rectifying voltage in Ni wires fabricated on a LiNbO3substrate

“…For example, time-resolved Kerr microscopy, [44][45][46] Brillouin light scattering [47][48][49][50][51] and timeresolve X-ray circular dichroism photoemission electron microscopy have been applied to obtain the magnetic images or time-resolved movies. [52][53][54] The electric detection technique is another candidate for achieving high sensitivity and easy accessibility for magnetization dynamics. In particular, the electric rectifying effect allows to the indirect detection of the resistance oscillations originating from the ferromagnetic resonance (FMR) as a function of the input microwave signal.…”