scholarly journals Effective field analysis using the full angular spin-orbit torque magnetometry dependence

2017 ◽  
Vol 95 (22) ◽  
Author(s):  
Tomek Schulz ◽  
Kyujoon Lee ◽  
Benjamin Krüger ◽  
Roberto Lo Conte ◽  
Gurucharan V. Karnad ◽  
...  
Keyword(s):  
Effective Field ◽  
Field Analysis ◽  
Spin Orbit ◽  
Torque Magnetometry

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.

Current-induced spin-orbit effective field modulations in synthetic antiferromagnetic structures

2019 ◽  
Vol 475 ◽  
pp. 327-333 ◽  
Author(s):  
S. Krishnia ◽  
C. Murapaka ◽  
P. Sethi ◽  
W.L. Gan ◽  
Q.Y. Wong ◽  
...  
Keyword(s):  
Effective Field ◽  
Spin Orbit

Inactivation of damping-like torque in Tb-Gd-Fe film on Ta layer

2021 ◽  
Author(s):  
Yuichiro Kurokawa ◽  
Masahiro Itoh ◽  
Masakazu Wakae ◽  
Masahiro Fujimoto ◽  
Uraku Kamihoki ◽  
...  
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Hall Effect ◽  
Effective Field ◽  
Spin Hall Effect ◽  
Spin Orbit

Abstract Recently, bulk spin orbit torques (SOTs) in transition metal-rare earth (TM-RE) ferrimagnets have been reported. In this study, to investigate bulk SOTs, we observed the current-induced effective field mediated by a damping-like torque (DLT), which is one of the components of SOTs, using TM-RE ferrimagnetic Tb x (Gd32Fe68)100-x films with a Ta layer. The DLT efficiency ξ DL was inactivated by increasing the Tb composition x to be greater than 8, suggesting that the DLT was induced by the bulk SOTs of Tb x (Gd32Fe68)100-x as well as the spin Hall effect in the Ta. However, from the DLT measurement using a Tb8(Gd32Fe68)92 layer sandwiched between Ru layers, where Ru has a negligibly small DLT, ξ DL was almost zero. This indicates that the inactivation of DLT cannot simply be explained by the bulk SOTs of Tb x (Gd32Fe68)100-x . However, we expect that this finding will provide meaningful insights for controlling magnetization using current.

scholarly journals N3LO gravitational spin-orbit coupling at order G4

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Michèle Levi ◽  
Andrew J. McLeod ◽  
Matthew von Hippel
Keyword(s):  
Effective Field Theory ◽  
Dimensional Regularization ◽  
Effective Field ◽  
Compact Objects ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Transcendental Numbers ◽  
Integration Techniques ◽  
First Time

Abstract In this paper we derive for the first time the N3LO gravitational spin-orbit coupling at order G4 in the post-Newtonian (PN) approximation within the effective field theory (EFT) of gravitating spinning objects. This represents the first computation in a spinning sector involving three-loop integration. We provide a comprehensive account of the topologies in the worldline picture for the computation at order G4. Our computation makes use of the publicly-available EFTofPNG code, which is extended using loop-integration techniques from particle amplitudes. We provide the results for each of the Feynman diagrams in this sector. The three-loop graphs in the worldline picture give rise to new features in the spinning sector, including divergent terms and logarithms from dimensional regularization, as well as transcendental numbers, all of which survive in the final result of the topologies at this order. This result enters at the 4.5PN order for maximally-rotating compact objects, and together with previous work in this line, paves the way for the completion of this PN accuracy.

DECREASE OF THE SPIN-ORBIT INTERACTION IN DRIP-LINE NUCLEI, USING RELATIVISTIC MEAN FIELD MODELS

2006 ◽  
Vol 15 (05) ◽  
pp. 1149-1155 ◽  
Author(s):  
M. S. MEHTA ◽  
B. K. SHARMA ◽  
S. K. PATRA ◽  
RAJ K. GUPTA ◽  
W. GREINER
Keyword(s):  
Field Model ◽  
Mean Field ◽  
Neutron Number ◽  
Effective Field ◽  
Drip Line ◽  
Energy Splitting ◽  
Spin Orbit ◽  
Mean Field Model ◽  
Relativistic Mean Field ◽  
Orbit Potential

The spin-orbit potential and the energy splitting of spin-orbit partners in nuclei towards the neutron drip-line are found to show the decreasing behavior with the increase of neutron number, in both the spherical and deformed versions of the standard relativistic mean field model, the SRMF and DRMF, and its extended version for spherical case, the effective field theory motivated relativistic mean field model, the E-RMF. The calculations are presented for nuclei in different mass regions, which include the isotopes of F , Mg , Sb , Pb and Bi nuclei.

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