Excited eigenmodes in magnetic vortex states of soft magnetic half-spheres and spherical caps

2014 ◽  
Vol 116 (22) ◽  
pp. 223902 ◽  
Author(s):  
Myoung-Woo Yoo ◽  
Jae-Hyeok Lee ◽  
Sang-Koog Kim
Keyword(s):  
Magnetic Vortex ◽  
Soft Magnetic ◽  
Vortex States ◽  
Spherical Caps

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 Magnetic Vortex States in Small Octahedral Particles of Intermediate Titanomagnetite

2018 ◽  
Vol 19 (9) ◽  
pp. 3071-3083 ◽  
Author(s):  
E. Khakhalova ◽  
B. M. Moskowitz ◽  
W. Williams ◽  
A. R. Biedermann ◽  
P. Solheid
Keyword(s):  
Magnetic Vortex ◽  
Vortex States

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

Magnetic vortex states in chromium(IV) oxide (CrO2)

2020 ◽  
Vol 494 ◽  
pp. 165845
Author(s):  
K. Balamurugan ◽  
P.S. Siva Sankaran ◽  
S. Manivannan
Keyword(s):  
Magnetic Vortex ◽  
Vortex States

scholarly journals Magnetic Vortex States in Toroidal Iron Oxide Nanoparticles: Combining Micromagnetics with Tomography

Nano Letters ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 7405-7412
Author(s):  
George R. Lewis ◽  
James C. Loudon ◽  
Robert Tovey ◽  
Yen-Hua Chen ◽  
Andrew P. Roberts ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Magnetic Vortex ◽  
Oxide Nanoparticles ◽  
Vortex States

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

Magnetism in Cylindrical NiFe Nanotubes

2010 ◽  
Vol 1258 ◽  
Author(s):  
hwifen liew ◽  
Sarjoosing Goolaup ◽  
Xinghua Wang ◽  
Wensiang Lew
Keyword(s):  
Wall Thickness ◽  
Material Properties ◽  
Magnetic Vortex ◽  
Magnetic Saturation ◽  
Nanotube Arrays ◽  
Magnetization Process ◽  
Conductive Layer ◽  
Soft Magnetic ◽  
Simulation Results ◽  
Nanoporous Templates

AbstractWe report the fabrication of ferromagnetic NiFe nanotubes with a wall thickness of 80 nm by electrodeposition in nanoporous templates. The structure and wall thickness of the nanotubes are controlled by the thickness of the conductive layer at the back of the templates. The NiFe nanotubes have shown soft magnetic material properties with high magnetic saturation and low coercivity. The NiFe nanotube arrays are preferentially magnetized in the perpendicular direction to the nanotubes. Micromagnetic simulation results show that a curling mode is perceived with the formation of opposite magnetic vortex states on the end of the nanotube surface during the magnetization process.

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