Energy barrier to magnetic vortex nucleation

2006 ◽  
Vol 88 (1) ◽  
pp. 012508 ◽  
Author(s):  
J. W. Lau ◽  
J. K. Bording ◽  
M. Beleggia ◽  
Y. Zhu
AIP Advances ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 105103
Author(s):  
Marek Vaňatka ◽  
Michal Urbánek ◽  
Roman Jíra ◽  
Lukáš Flajšman ◽  
Meena Dhankhar ◽  
...  

Nanoscale ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 2587-2595
Author(s):  
M. J. Martínez-Pérez ◽  
B. Müller ◽  
J. Lin ◽  
L. A. Rodriguez ◽  
E. Snoeck ◽  
...  

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


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

2019 ◽  
Author(s):  
Danijela Gregurec ◽  
Alexander W. Senko ◽  
Andrey Chuvilin ◽  
Pooja Reddy ◽  
Ashwin Sankararaman ◽  
...  

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>


2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  

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.


2018 ◽  
Author(s):  
Marcus J. Giansiracusa ◽  
Andreas Kostopoulos ◽  
George F. S. Whitehead ◽  
David Collison ◽  
Floriana Tuna ◽  
...  

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.


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

1989 ◽  
Vol 128 (1) ◽  
pp. 137-145 ◽  
Author(s):  
Piotr Warszynski ◽  
Jan Czarnecki
Keyword(s):  

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