Energy barrier to magnetic vortex nucleation

2006 ◽  
Vol 88 (1) ◽  
pp. 012508 ◽  
Author(s):  
J. W. Lau ◽  
J. K. Bording ◽  
M. Beleggia ◽  
Y. Zhu
Keyword(s):  
Energy Barrier ◽  
Magnetic Vortex ◽  
Vortex Nucleation

scholarly journals Magnetic vortex nucleation modes in static magnetic fields

AIP Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 105103
Author(s):  
Marek Vaňatka ◽  
Michal Urbánek ◽  
Roman Jíra ◽  
Lukáš Flajšman ◽  
Meena Dhankhar ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Magnetic Vortex ◽  
Static Magnetic Fields ◽  
Vortex Nucleation

Magnetic vortex nucleation and annihilation in bi-stable ultra-small ferromagnetic particles

Nanoscale ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 2587-2595
Author(s):  
M. J. Martínez-Pérez ◽  
B. Müller ◽  
J. Lin ◽  
L. A. Rodriguez ◽  
E. Snoeck ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Temporal Stability ◽  
Magnetic Vortex ◽  
Magnetic Vortices ◽  
Full Picture ◽  
Ferromagnetic Particles ◽  
Vortex Nucleation

We nucleate and manipulate magnetic vortices in ultrasmall magnetic nanoparticles and provide the full picture of their thermal and temporal stability.

scholarly journals Magnetic vortex nucleation/annihilation in artificial-ferrimagnet microdisks

2017 ◽  
Vol 122 (8) ◽  
pp. 083903 ◽  
Author(s):  
Pavel N. Lapa ◽  
Junjia Ding ◽  
Charudatta Phatak ◽  
John E. Pearson ◽  
J. S. Jiang ◽  
...  
Keyword(s):  
Magnetic Vortex ◽  
Vortex Nucleation

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>

Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Hysteresis ◽  
Large Energy ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Single Molecule Magnet ◽  
Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy<sub>2</sub>L<sub>2</sub>(<i>µ</i>-Cl)<sub>2</sub>(THF)<sub>2</sub>] has been made using a diamine-bis(phenolate) ligand, H<sub>2</sub>L. Magnetic studies show an energy barrier for magnetization reversal (<i>U</i><sub>eff</sub>) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. <i>Ab</i> initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange <i>via</i> the chloride bridging ligands is important.

Correlating Blocking Temperatures in Single Molecule Magnets with Raman Relaxation

2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Single Molecule ◽  
Energy Barrier ◽  
Thermal Relaxation ◽  
Relaxation Mechanism ◽  
Blocking Temperature ◽  
Single Molecule Magnets ◽  
Single Molecule Magnet ◽  
Key Parameter

We report a six coordinate DyIII single-molecule magnet<br>(SMM) with an energy barrier of 1110 K for thermal relaxation of<br>magnetization. The sample shows no retention of magnetization<br>even at 2 K and this led us to find a good correlation between the<br>blocking temperature and the Raman relaxation regime for SMMs.<br>The key parameter is the relaxation time (𝜏<sub>switch</sub>) at the point where<br>the Raman relaxation mechanism becomes more important than<br>Orbach.

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

Transfer of particles over a randomly fluctuating energy barrier

1989 ◽  
Vol 128 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Piotr Warszynski ◽  
Jan Czarnecki
Keyword(s):  
Energy Barrier
Sign in / Sign up

Export Citation Format

Share Document