Slow magnetization dynamics and energy barriers near vortex state nucleation in circular permalloy dots

2011 ◽  
Vol 99 (5) ◽  
pp. 052512 ◽  
Author(s):  
G. N. Kakazei ◽  
M. Ilyn ◽  
O. Chubykalo-Fesenko ◽  
J. Gonzalez ◽  
A. A. Serga ◽  
...  
Keyword(s):  
Vortex State ◽  
Magnetization Dynamics ◽  
Energy Barriers

scholarly journals Broadband probing magnetization dynamics of the coupled vortex state permalloy layers in nanopillars

2012 ◽  
Vol 100 (26) ◽  
pp. 262406 ◽  
Author(s):  
A. A. Awad ◽  
A. Lara ◽  
V. Metlushko ◽  
K. Y. Guslienko ◽  
F. G. Aliev
Keyword(s):  
Vortex State ◽  
Magnetization Dynamics

scholarly journals Magnetization dynamics in spin torque nano-oscillators: Vortex state versus uniform state

2009 ◽  
Vol 80 (5) ◽  
Author(s):  
R. Lehndorff ◽  
D. E. Bürgler ◽  
S. Gliga ◽  
R. Hertel ◽  
P. Grünberg ◽  
...  
Keyword(s):  
Vortex State ◽  
Spin Torque ◽  
Magnetization Dynamics ◽  
Uniform State

Magnetic Aging

2005 ◽  
Vol 887 ◽  
Author(s):  
R. Skomski ◽  
J. Zhou ◽  
R. D. Kirby ◽  
D. J. Sellmyer
Keyword(s):  
Free Energy ◽  
Power Law ◽  
Magnetization Reversal ◽  
Eddy Currents ◽  
Scientific Research ◽  
Magnetization Dynamics ◽  
Energy Barriers ◽  
Thermally Activated ◽  
Magnetic Aging ◽  
Magnetization Processes

ABSTRACTThermally activated magnetization reversal is of great importance in areas such as permanent magnetism and magnetic recording. In spite of many decades of scientific research, the phenomenon of slow magnetization dynamics has remained partially controversial. It is now well-established that the main mechanism is thermally activated magnetization reversal, as contrasted to eddy currents and structural aging, but the identification of the involved energy barriers remains a challenge for many systems. Thermally activated slow magnetization processes proceed over energy barriers whose structure is determined by the micromagnetic free energy. This restricts the range of physically meaningful energy barriers. An analysis of the underlying micromagnetic free energy yields power-law dependences with exponents of 3/2 or 2 for physically reasonable models, in contrast to arbitrary exponents m and to 1/H-type laws.

Two C2v symmetry dysprosium(iii) single-molecule magnets with effective energy barriers over 600 K

2021 ◽  
Author(s):  
Xixi Meng ◽  
Mengmeng Wang ◽  
Xiaoshuang Gou ◽  
Wenlong Lan ◽  
Kexin Jia ◽  
...  
Keyword(s):  
Single Molecule ◽  
High Performance ◽  
Effective Energy ◽  
Magnetization Dynamics ◽  
Energy Barriers ◽  
Single Molecule Magnets

Two high-performance C2v symmetry dysprosium(iii) single-molecule magnets were synthesized. The mechanism of magnetization dynamics was studied in detail.

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>

Calculation of the free energy barriers in the oligomerisation of Ab

10.2741/3104 ◽  
2008 ◽  
Vol Volume (13) ◽  
pp. 5614 ◽  
Author(s):  
Mookyung Cheon
Keyword(s):  
Free Energy ◽  
Energy Barriers

scholarly journals A pressure induced reversal to the 9R perovskite in Ba3MoNbO8.5

2021 ◽  
Vol 9 (10) ◽  
pp. 6567-6574
Author(s):  
B. Sherwood ◽  
C. J. Ridley ◽  
C. L. Bull ◽  
S. Fop ◽  
J. M. S. Skakle ◽  
...  
Keyword(s):  
Bulk Modulus ◽  
Structural Transformation ◽  
Pressure Response ◽  
Energy Barriers ◽  
Transport Pathways

The pressure response of Ba3MoNbO8.5 reveals a structural transformation, which acts to increase the energy barriers to migration along all available transport pathways, and an exceptionally low bulk modulus.

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