scholarly journals Out-of-plane current controlled switching of the fourfold degenerate state of a magnetic vortex in soft magnetic nanodots

2010 ◽  
Vol 96 (7) ◽  
pp. 072507 ◽  
Author(s):  
Youn-Seok Choi ◽  
Myoung-Woo Yoo ◽  
Ki-Suk Lee ◽  
Young-Sang Yu ◽  
Hyunsung Jung ◽  
...  
Keyword(s):  
Magnetic Vortex ◽  
Degenerate State ◽  
Soft Magnetic ◽  
Magnetic Nanodots ◽  
Controlled Switching ◽  
Out Of Plane

scholarly journals Universal Criterion and Phase Diagram for Switching a Magnetic Vortex Core in Soft Magnetic Nanodots

2008 ◽  
Vol 101 (26) ◽  
Author(s):  
Ki-Suk Lee ◽  
Sang-Koog Kim ◽  
Young-Sang Yu ◽  
Youn-Seok Choi ◽  
Konstantin Yu. Guslienko ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Vortex Core ◽  
Magnetic Vortex ◽  
Soft Magnetic ◽  
Magnetic Nanodots

Pinning-assisted out-of-plane anisotropy in reverse stack FeCo/FePt intermetallic bilayers for controlled switching in spintronics

2021 ◽  
pp. 160249
Author(s):  
Garima Vashisht ◽  
Utkarsh Shashank ◽  
Surbhi Gupta ◽  
Rohit Medwal ◽  
C.L. Dong ◽  
...  
Keyword(s):  
Controlled Switching ◽  
Plane Anisotropy ◽  
Out Of Plane

scholarly journals Micromagnetic Simulations of Submicron Vortex Structures for the Detection of Superparamagnetic Labels

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5819
Author(s):  
Lukas Wetterau ◽  
Claas Abert ◽  
Dieter Suess ◽  
Manfred Albrecht ◽  
Bernd Witzigmann
Keyword(s):  
Electric Potential ◽  
Giant Magnetoresistance ◽  
Spin Diffusion ◽  
Magnetic Vortex ◽  
Electric Response ◽  
Stray Field ◽  
Soft Magnetic ◽  
Micromagnetic Simulations ◽  
Gmr Sensor ◽  
Magnetization Change

We present a numerical investigation on the detection of superparamagnetic labels using a giant magnetoresistance (GMR) vortex structure. For this purpose, the Landau–Lifshitz–Gilbert equation was solved numerically applying an external z-field for the activation of the superparamagnetic label. Initially, the free layer’s magnetization change due to the stray field of the label is simulated. The electric response of the GMR sensor is calculated by applying a self-consistent spin-diffusion model to the precomputed magnetization configurations. It is shown that the soft-magnetic free layer reacts on the stray field of the label by shifting the magnetic vortex orthogonally to the shift direction of the label. As a consequence, the electric potential of the GMR sensor changes significantly for label shifts parallel or antiparallel to the pinning of the fixed layer. Depending on the label size and its distance to the sensor, the GMR sensor responds, changing the electric potential from 26.6 mV to 28.3 mV.

scholarly journals Stiffness in vortex—like structures due to chirality-domains within a coupled helical rare-earth superlattice

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Amitesh Paul
Keyword(s):  
Rare Earth ◽  
Domain Walls ◽  
Topological Defects ◽  
Magnetic Ordering ◽  
Direct Consequence ◽  
Magnetic Vortex ◽  
Range Magnetic Order ◽  
Wide Range ◽  
Out Of Plane ◽  
The Stability

Abstract Vortex domain walls poses chirality or ‘handedness’ which can be exploited to act as memory units by changing their polarity with electric field or driving/manupulating the vortex itself by electric currents in multiferroics. Recently, domain walls formed by one dimensional array of vortex—like structures have been theoretically predicted to exist in disordered rare-earth helical magnets with topological defects. Here, in this report, we have used a combination of two rare-earth metals, e.g."Equation missing" superlattice that leads to long range magnetic order despite their competing anisotropies along the out-of-plane (Er) and in-plane (Tb) directions. Probing the vertically correlated magnetic structures by off-specular polarized neutron scattering we confirm the existence of such magnetic vortex—like domains associated with magnetic helical ordering within the Er layers. The vortex—like structures are predicted to have opposite chirality, side—by—side and are fairly unaffected by the introduction of magnetic ordering between the interfacial Tb layers and also with the increase in magnetic field which is a direct consequence of screening of the vorticity in the system due to a helical background. Overall, the stability of these vortices over a wide range of temperatures, fields and interfacial coupling, opens up the opportunity for fundamental chiral spintronics in unconventional systems.

Coherent precession in arrays of dipolar-coupled soft magnetic nanodots

2015 ◽  
Vol 117 (24) ◽  
pp. 243905 ◽  
Author(s):  
X. K. Hu ◽  
H. Dey ◽  
N. Liebing ◽  
H. W. Schumacher ◽  
G. Csaba ◽  
...  
Keyword(s):  
Soft Magnetic ◽  
Magnetic Nanodots

scholarly journals Electric-current-driven vortex-core reversal in soft magnetic nanodots

2007 ◽  
Vol 91 (8) ◽  
pp. 082506 ◽  
Author(s):  
Sang-Koog Kim ◽  
Youn-Seok Choi ◽  
Ki-Suk Lee ◽  
Konstantin Y. Guslienko ◽  
Dae-Eun Jeong
Keyword(s):  
Electric Current ◽  
Vortex Core ◽  
Soft Magnetic ◽  
Magnetic Nanodots

scholarly journals Stability of magnetic vortex in soft magnetic nano-sized circular cylinder

2002 ◽  
Vol 242-245 ◽  
pp. 1015-1017 ◽  
Author(s):  
Konstantin L Metlov ◽  
Konstantin Yu Guslienko
Keyword(s):  
Circular Cylinder ◽  
Magnetic Vortex ◽  
Soft Magnetic
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