scholarly journals Magnetic Vortex Induced by Nonmagnetic Impurity in Ferromagnets: Magnetic Multipole and Toroidal around the Vacancy

2019 ◽  
Vol 88 (6) ◽  
pp. 063702 ◽  
Author(s):  
Satoru Hayami ◽  
Hiroaki Kusunose ◽  
Yukitoshi Motome
Keyword(s):  
Magnetic Vortex ◽  
Nonmagnetic Impurity

scholarly journals Magnetic Vortex Induced by Nonmagnetic Impurity in Frustrated Magnets

2016 ◽  
Vol 116 (18) ◽  
Author(s):  
Shi-Zeng Lin ◽  
Satoru Hayami ◽  
Cristian D. Batista
Keyword(s):  
Magnetic Vortex ◽  
Frustrated Magnets ◽  
Nonmagnetic Impurity

Tuning the Magnetic Vortex State in Magnetite Nanodiscs for Remote Control of Biological Signalling

2019 ◽  
Author(s):  
Danijela Gregurec ◽  
Alexander W. Senko ◽  
Andrey Chuvilin ◽  
Pooja Reddy ◽  
Ashwin Sankararaman ◽  
...  
Keyword(s):  
Remote Control ◽  
Ion Channels ◽  
Ground State ◽  
Magnetic Particles ◽  
Colloidal Stability ◽  
Vortex State ◽  
Magnetic Vortex ◽  
Electron Holography ◽  
Dipole Interactions ◽  
Magnetite Particles

In this work, we demonstrate the application of anisotropic magnetite nanodiscs (MNDs) as transducers of torque to mechanosensory cells under weak, slowly varying magnetic fields (MFs). These MNDs possess a ground state vortex configuration of magnetic spins which affords greater colloidal stability due to eliminated dipole-dipole interactions characteristic of isotropic magnetic particles of similar size. We first predict vortex magnetization using micromagnetic stimulations in sub-micron anisotropic magnetite particles and then use electron holography to experimentally investigate the magnetization of MNDs 98–226 nm in diameter. When MNDs are coupled to MFs, they transition between vortex and in-plane magnetization allowing for the exertion of the torque on the pN scale, which is sufficient to activate mechanosensitive ion channels in cell membranes.<br>

Interaction of a Magnetic Vortex with Magnetic Anisotropy Nonuniformity

2020 ◽  
Vol 131 (4) ◽  
pp. 589-599
Author(s):  
V. A. Orlov ◽  
G. S. Patrin ◽  
I. N. Orlova
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Vortex
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