Time-resolved EPR spectra of short biradicals (1,3- to 1,8-) in solution. The interconnecting roles of the external magnetic field, dipolar coupling, exchange interaction, and molecular motion in the spin polarization and relaxation mechanisms

1993 ◽  
Vol 97 (50) ◽  
pp. 13223-13233 ◽  
Author(s):  
Malcolm D. E. Forbes ◽  
Shiyamalie R. Ruberu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Exchange Interaction ◽  
Spin Polarization ◽  
Molecular Motion ◽  
Dipolar Coupling ◽  
Epr Spectra ◽  
Time Resolved

scholarly journals Cluster magnetic octupole induced out-of-plane spin polarization in antiperovskite antiferromagnet

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yunfeng You ◽  
Hua Bai ◽  
Xiaoyu Feng ◽  
Xiaolong Fan ◽  
Lei Han ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Polarization ◽  
Magnetic Layer ◽  
High Density ◽  
Spin Configuration ◽  
Spintronic Devices ◽  
Out Of Plane ◽  
Flow Through ◽  
New Perspective

AbstractOut-of-plane spin polarization σz has attracted increasing interests of researchers recently, due to its potential in high-density and low-power spintronic devices. Noncollinear antiferromagnet (AFM), which has unique 120° triangular spin configuration, has been discovered to possess σz. However, the physical origin of σz in noncollinear AFM is still not clear, and the external magnetic field-free switching of perpendicular magnetic layer using the corresponding σz has not been reported yet. Here, we use the cluster magnetic octupole in antiperovskite AFM Mn3SnN to demonstrate the generation of σz. σz is induced by the precession of carrier spins when currents flow through the cluster magnetic octupole, which also relies on the direction of the cluster magnetic octupole in conjunction with the applied current. With the aid of σz, current induced spin-orbit torque (SOT) switching of adjacent perpendicular ferromagnet is realized without external magnetic field. Our findings present a new perspective to the generation of out-of-plane spin polarizations via noncollinear AFM spin structure, and provide a potential path to realize ultrafast high-density applications.

scholarly journals Влияние магнитомягкой фазы на процессы перемагничивания магнитотвердого/магнитомягкого бислоя

2020 ◽  
Vol 62 (6) ◽  
pp. 846
Author(s):  
Т.А. Тааев ◽  
К.Ш. Хизриев ◽  
А.К. Муртазаев
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
External Magnetic Field ◽  
Exchange Interaction ◽  
Magnetization Reversal ◽  
Magnetic Layer ◽  
Anisotropy Constant ◽  
Soft Magnetic ◽  
The Monte Carlo Method

Investigation of the magnetization reversal of a hard/soft magnetic bilayer in an external magnetic field was performed by the Monte Carlo method. The magnetization reversal curves of the magnetic bilayer are plotted for various values of the thickness of the soft magnetic layer. Also the effect of the intralayer exchange interaction and the anisotropy constant on the magnetization reversal processes was studied. The phase diagrams of the magnetic bilayer are plotted.

scholarly journals Reversible rearrangement of magnetic nanoparticles in solution studied using time-resolved SAXS method

2019 ◽  
Vol 26 (4) ◽  
pp. 1294-1301
Author(s):  
Lanqing Huang ◽  
Jingeng Mai ◽  
Qihui Zhu ◽  
Zhen Guo ◽  
Siying Qin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Beads ◽  
Permanent Magnets ◽  
Superparamagnetic Nanoparticles ◽  
Shanghai Synchrotron Radiation Facility ◽  
Time Resolved ◽  
X Ray ◽  
Quantitative Measurements

Superparamagnetic nanoparticles have broad applications in biology and medicines. Quantitative measurements of magnetic beads in solution are essential in gaining comprehensive understanding of their dynamics and developing applications. Here, using synchrotron X-ray sources combined with well controlled magnetic fields, the results from small-angle X-ray scattering (SAXS) experiments on superparamagnetic particles in solution under the influence of external magnetic fields are reported. The particles mostly remain in monodispersed states and the linear aggregates tend to be aligned with the external magnetic field. After removing the magnetic fields, the superparamagnetic nanoparticles quickly recover to their original states indicating high reversibility of the rearrangement under the control of a magnetic field. The external magnetic field instrument composed of paired permanent magnets is integrated into the SAXS beamline at the Shanghai Synchrotron Radiation Facility providing a platform for studying time-resolved dynamics induced by magnetic fields.

scholarly journals Observation of anti-damping spin-orbit torques generated by in-plane and out-of-plane spin polarizations in MnPd3

2021 ◽  
Author(s):  
Mahendra DC ◽  
Ding-Fu Shao ◽  
Vincent Hou ◽  
Patrick Quarterman ◽  
Ali Habiboglu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
External Magnetic Field ◽  
Spin Polarization ◽  
Density Functional ◽  
Ferromagnetic Layer ◽  
Magnetic Memory ◽  
Spin Orbit ◽  
Logic Devices ◽  
Out Of Plane

Abstract High spin-orbit torques (SOTs) generated by topological materials and heavy metals interfaced with a ferromagnetic layer show promise for next generation magnetic memory and logic devices. SOTs generated from the in-plane spin polarization along y-axis originated by the spin Hall and Edelstein effects can switch magnetization collinear with the spin polarization in the absence of external magnetic fields. However, an external magnetic field is required to switch the magnetization along x and z-axes via SOT generated by y-spin polarization. Here, we present that the above limitation can be circumvented by unconventional SOT in magnetron-sputtered thin film MnPd3. In addition to the conventional in-plane anti-damping-like torque due to the y-spin polarization, out-of-plane and in-plane anti-damping-like torques originating from z-spin and x-spin polarizations, respectively have been observed at room temperature. The spin torque efficiency (θ_y) corresponding to the y-spin polarization from MnPd3 thin films grown on thermally oxidized silicon substrate and post annealed at 400 ℃ is 0.34 - 0.44 while the spin conductivity (σ_zx^y) is ~ 5.70 – 7.30× 105 ℏ⁄2e Ω-1m-1. Remarkably, we have demonstrated complete external magnetic field-free switching of perpendicular Co layer via unconventional out-of-plane anti-damping-like torque from z-spin polarization. Based on the density functional theory calculations, we determine that the observed x- and z- spin polarizations with the in-plane charge current are due to the low symmetry of the (114) oriented MnPd3 thin films. Taken together, the new material reported here provides a path to realize a practical spin channel in ultrafast magnetic memory and logic devices.

μSR STUDY ON THE Cu-SPIN STATE IN La2-xSrxCu1-yZnyO4

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3741-3746
Author(s):  
I. WATANABE ◽  
M. AOYAMA ◽  
M. AKOSHIMA ◽  
K. NISHIMAKI ◽  
T. KAWAMATA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Excited State ◽  
External Magnetic Field ◽  
Spin Polarization ◽  
Low Temperatures ◽  
Muon Spin ◽  
One Dimensional ◽  
Dynamical Properties ◽  
High Possibility ◽  
Ordered State

Static and dynamical properties of Cu spins in the overdoped single-crystals of La 2-x Sr x Cu 1-y Zn y O 4 have been investigated by the muon-spin-relaxation (μSR) method. In the Zn-substituted single-crystal with x=0.21 and y=0.01, where the high-T c superconductivity is anomalously suppressed, a coexisting state of statically ordered Cu-spins and localized holes has been found at low temperatures below about 2 K. The dynamical depolarization rate of the muon spin at 3.0 K has been found to be nearly proportional to minus-root-square of the external magnetic-field applied along the initial muon-spin polarization. This field-dependence can be explained by assuming the existence of an excited state of the Cu spins diffusing in a one-dimensional direction. The present study suggests a high possibility of the existence of a new one-dimensional stripe ordered state of the Cu spins and doped holes at x=0.21 in the overdoped region of La 2-x Sr x Cu 1-y Zn y O 4.

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