Magnetic dipole excitations ofCr50

Abstract

The low-lying M 1-strength of the open-shell nucleus 50 Cr has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV, using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility between 6 and 9.7 MeV of the initial photon energy. Fifteen 1 + states have been observed between 3.6 and 9.7 MeV. Following our analysis, the lowest 1 + state at 3.6 MeV can be considered as an isovector orbital mode with some spin admixture. The obtained results generally match the estimations and trends typical for the scissors-like mode. Detailed calculations within the Skyrme Quasiparticle Random-Phase-Approximation method and the Large-Scale Shell Model justify our conclusions. The calculated distributions of the orbital current for the lowest 1 + -state suggest the schematic view of Lipparini and Stringari (isovector rotation-like oscillations inside the rigid surface) rather than the scissors-like picture of Lo Iudice and Palumbo. The spin M1 resonance is shown to be mainly generated by spin-flip transitions between the orbitals of the f p-shell.

Manipulation of Magnetization by Spin–Orbit Torque

“…However, when an external magnetic field applied along the current direction alters the central domain wall moments, the SOTs driving the adjacent domain walls with different velocities will result in magnetization switching. [21,79,82,83] Recently, magnetization switching by SOTdriven domain wall motion has been observed by spatially and time-resolved magneto-optical Kerr effect (MOKE). [82] Driving the motion of skyrmions by SOTs is attractive due to the ultralow critical current density (below 10 2 A cm −2 ) [84] and potential for high-density information storage.…”

Investigation ofJ=1states and theirγ-decay behavior inCr52

“…To further investigate the magnetic dipole strength distribution, complementary experiments with photons, that selectively excite J = 1 states, are very useful. Bremsstrahlung experiments with continuos photon flux have been performed for 40,44,48 Ca, 50,52 Cr, 56 Fe and 58,60 Ni [23][24][25][26][27][32][33][34][35]. Additionally, for some of those nuclei, almost monoenergetic γ-ray beams from Laser-Compton backscattering (LCB) have been used [25][26][27]35].…”

Field-Free Switching of a Spin-Orbit-Torque Device Through Interlayer-Coupling-Induced Domain Walls

“…A home-made polar surface magneto optical Kerr (MOKE) microscope illuminated by green LED is employed to characterize the domain distribution. The loop shift method first introduced by Pai et al [30] is applied to evaluate the effective field generated by DMI on a vector magnet which can apply longitudinal and vertical magnetic field to the device at the same time. All the measurements and applied field directions follow the geometry noted in Figure 1…”

“…To further understand the DW assisted switching it is necessary to investigate the effective field generated by the SOT. Compared to the harmonic method(Supplementary Note), the current assisted loop-shifting measurements [30,[32][33][34] is more appropriate in the existence of DWs. In this method, colinear static magnetic field Hx and bias current Ib are applied to the current channel of the Hall-bar during the measurement of RH values versus Hz.…”