Spin-orbit torque in a Ni-Fe single layer

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
Takeshi Seki ◽  
Yong-Chang Lau ◽  
Satoshi Iihama ◽  
Koki Takanashi
Keyword(s):  
Single Layer ◽  
Spin Orbit

scholarly journals Controllable field-free switching of perpendicular magnetization through bulk spin-orbit torque in symmetry-broken ferromagnetic films

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuejie Xie ◽  
Xiaonan Zhao ◽  
Yanan Dong ◽  
Xianlin Qu ◽  
Kun Zheng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Domain Walls ◽  
Single Layer ◽  
Ferromagnetic Film ◽  
Effective Field ◽  
Composition Gradient ◽  
Spin Orbit ◽  
Interlayer Exchange Coupling ◽  
Magnetization Switching ◽  
Perpendicular Magnetization

AbstractProgrammable magnetic field-free manipulation of perpendicular magnetization switching is essential for the development of ultralow-power spintronic devices. However, the magnetization in a centrosymmetric single-layer ferromagnetic film cannot be switched directly by passing an electrical current in itself. Here, we demonstrate a repeatable bulk spin-orbit torque (SOT) switching of the perpendicularly magnetized CoPt alloy single-layer films by introducing a composition gradient in the thickness direction to break the inversion symmetry. Experimental results reveal that the bulk SOT-induced effective field on the domain walls leads to the domain walls motion and magnetization switching. Moreover, magnetic field-free perpendicular magnetization switching caused by SOT and its switching polarity (clockwise or counterclockwise) can be reversibly controlled in the IrMn/Co/Ru/CoPt heterojunctions based on the exchange bias and interlayer exchange coupling. This unique composition gradient approach accompanied with electrically controllable SOT magnetization switching provides a promising strategy to access energy-efficient control of memory and logic devices.

Plasmon modes in N-layer silicene structures

2021 ◽  
Author(s):  
Men Nguyen Van
Keyword(s):  
Electric Field ◽  
Random Phase ◽  
Single Layer ◽  
Plasmon Mode ◽  
Orbit Coupling ◽  
Collective Excitations ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Number Of Layers ◽  
Plasmon Modes

Abstract We investigate the plasmon properties in N-layer silicene systems consisting of N, up to 6, parallel single-layer silicene under the application of an out-of-plane electric field, taking into account the spin-orbit coupling within the random-phase approximation. Numerical calculations demonstrate that N undamped plasmon modes, including one in-phase optical and (N-1) out-of-phase acoustic modes, continue mainly outside the single-particle excitation area of the system. As the number of layers increases, the frequencies of plasmonic collective excitations increase and can become much larger than that in single layer silicene, more significant for high-frequency modes. The optical (acoustic) plasmon mode(s) noticeably (slightly) decreases with the increase in the bandgap and weakly depends on the number of layers. We observe that the phase transition of the system weakly affects the plasmon properties, and as the bandgap caused by the spin-orbit coupling equal that caused by the external electric field, the plasmonic collective excitations and their broadening function in multilayer silicene behave similarly to those in multilayer gapless graphene structures. Our investigations show that plasmon curves in the system move toward that in single layer silicene as the separation increases, and the impacts of this factor can be raised by a large number of layers in the system. Finally, we find that the imbalanced carrier density between silicene layers significantly decreases plasmon frequencies, depending on the number of layers.

scholarly journals Anomalous spin–orbit torques in magnetic single-layer films

2019 ◽  
Vol 14 (9) ◽  
pp. 819-824 ◽  
Author(s):  
Wenrui Wang ◽  
Tao Wang ◽  
Vivek P. Amin ◽  
Yang Wang ◽  
Anil Radhakrishnan ◽  
...  
Keyword(s):  
Single Layer ◽  
Spin Orbit

scholarly journals Robustness of Basal-Plane Antiferromagnetic Order and theJeff=1/2State in Single-Layer Iridate Spin-Orbit Mott Insulators

2013 ◽  
Vol 110 (11) ◽  
Author(s):  
S. Boseggia ◽  
R. Springell ◽  
H. C. Walker ◽  
H. M. Rønnow ◽  
Ch. Rüegg ◽  
...  
Keyword(s):  
Basal Plane ◽  
Single Layer ◽  
Antiferromagnetic Order ◽  
Mott Insulators ◽  
Spin Orbit

scholarly journals Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Je-Ho Lee ◽  
Youngsu Choi ◽  
Seung-Hwan Do ◽  
Beom Hyun Kim ◽  
Maeng-Je Seong ◽  
...  
Keyword(s):  
Single Layer ◽  
Thin Layers ◽  
Thickness Dependence ◽  
Numerical Calculations ◽  
Spectral Energy ◽  
Spin Orbit ◽  
Spin Liquids ◽  
Double Spin ◽  
Electronic Parameters ◽  
Lattice Distortions

AbstractThe van der Waals Kitaev magnet α-RuCl3 has recently garnered considerable attention due to its possible realization of topological spin liquids. Combining Raman spectroscopy with numerical calculations, we report here the thickness dependence of electronic structure and ensuing low-energy excitations for exfoliated α-RuCl3. We observe two pronounced peaks at A1 = 249 meV and A2 = 454 meV, which are assigned to single and double spin-orbit (SO) excitons, respectively. Our numerical calculations support this interpretation by reproducing their spectral energy and shape with the electronic parameters: SO coupling λ = 140 meV, Hund’s coupling JH = 350 meV, and on-site Coulomb interaction U = 2.35 eV. The multiple SO excitons persist down to a single layer, whereas their peaks shift slightly to lower energy. For frequencies below 350 cm−1, both a magnetic continuum and phonons show noticeable thickness dependence. These results demonstrate that a SO entangled jeff = 1/2 picture remains valid in a monolayer limit despite the presence of lattice distortions.

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