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

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

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>

scholarly journals Vortex State Microwave Resistivity in Tl-2212 Thin Films

2007 ◽  
Vol 20 (1) ◽  
pp. 43-49 ◽  
Author(s):  
N. Pompeo ◽  
S. Sarti ◽  
R. Marcon ◽  
H. Schneidewind ◽  
E. Silva
Keyword(s):  
Thin Films ◽  
Vortex State ◽  
Microwave Resistivity

scholarly journals Ultrafast optical manipulation of magnetic order in ferromagnetic materials

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Chuangtang Wang ◽  
Yongmin Liu
Keyword(s):  
Data Storage ◽  
Optical Switching ◽  
Ultrafast Lasers ◽  
Transport Model ◽  
Magnetic Interaction ◽  
Ferromagnetic Materials ◽  
Magnetic Storage ◽  
Magnetization Dynamics ◽  
Quarter Century ◽  
Ultrafast Optical

Abstract The interaction between ultrafast lasers and magnetic materials is an appealing topic. It not only involves interesting fundamental questions that remain inconclusive and hence need further investigation, but also has the potential to revolutionize data storage technologies because such an opto-magnetic interaction provides an ultrafast and energy-efficient means to control magnetization. Fruitful progress has been made in this area over the past quarter century. In this paper, we review the state-of-the-art experimental and theoretical studies on magnetization dynamics and switching in ferromagnetic materials that are induced by ultrafast lasers. We start by describing the physical mechanisms of ultrafast demagnetization based on different experimental observations and theoretical methods. Both the spin-flip scattering theory and the superdiffusive spin transport model will be discussed in detail. Then, we will discuss laser-induced torques and resultant magnetization dynamics in ferromagnetic materials. Recent developments of all-optical switching (AOS) of ferromagnetic materials towards ultrafast magnetic storage and memory will also be reviewed, followed by the perspectives on the challenges and future directions in this emerging area.

scholarly journals Effect of strain-induced anisotropy on magnetization dynamics in Y3Fe5O12 films recrystallized on a lattice-mismatched substrate

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Adam Krysztofik ◽  
Sevgi Özoğlu ◽  
Robert D. McMichael ◽  
Emerson Coy
Keyword(s):  
Dispersion Model ◽  
Perpendicular Magnetic Anisotropy ◽  
Negative Slope ◽  
Recrystallization Process ◽  
Induced Anisotropy ◽  
Magnetization Dynamics ◽  
Unexpected Formation ◽  
Lattice Matched ◽  
Ferromagnetic Resonance Linewidth ◽  
Lattice Mismatched Substrate

AbstractWe report on the correlation of structural and magnetic properties of Y3Fe5O12 (YIG) films deposited on Y3Al5O12 substrates using pulsed laser deposition. The recrystallization process leads to an unexpected formation of interfacial tensile strain and consequently strain-induced anisotropy contributing to the perpendicular magnetic anisotropy. The ferromagnetic resonance linewidth of YIG is significantly increased in comparison to a film on a lattice-matched Gd3Ga5O12 substrate. Notably, the linewidth dependency on frequency has a negative slope. The linewidth behavior is explained with the proposed anisotropy dispersion model.

Sign in / Sign up

Export Citation Format

Share Document