Transition from strongly collective to completely isolated ultrafast magnetization dynamics in two-dimensional hexagonal arrays of nanodots with varying inter-dot separation

RSC Advances ◽  
2016 ◽  
Vol 6 (111) ◽  
pp. 110393-110399 ◽  
Author(s):  
Sucheta Mondal ◽  
Samiran Choudhury ◽  
Saswati Barman ◽  
YoshiChika Otani ◽  
Anjan Barman
Keyword(s):  
Magnetic Storage ◽  
Two Dimensional ◽  
Magnetization Dynamics ◽  
Collective Dynamics ◽  
Communication Devices ◽  
Ultrafast Magnetization ◽  
Hexagonal Arrays

Ultrafast magnetization dynamics of hexagonal arrays of ferromagnetic nanodots shows transition between various collective dynamics with varying interdot separation promising their applications in magnetic storage, memory and communication devices.

scholarly journals Field-controlled ultrafast magnetization dynamics in two-dimensional nanoscale ferromagnetic antidot arrays

2018 ◽  
Vol 9 ◽  
pp. 1123-1134 ◽  
Author(s):  
Anulekha De ◽  
Sucheta Mondal ◽  
Sourav Sahoo ◽  
Saswati Barman ◽  
Yoshichika Otani ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Wave ◽  
Lattice Constant ◽  
Magnetic Storage ◽  
Magnetization Dynamics ◽  
Bias Magnetic Field ◽  
Potential Applications ◽  
Ultrafast Magnetization ◽  
Antidot Arrays ◽  
Wave Modes

Ferromagnetic antidot arrays have emerged as a system of tremendous interest due to their interesting spin configuration and dynamics as well as their potential applications in magnetic storage, memory, logic, communications and sensing devices. Here, we report experimental and numerical investigation of ultrafast magnetization dynamics in a new type of antidot lattice in the form of triangular-shaped Ni80Fe20 antidots arranged in a hexagonal array. Time-resolved magneto-optical Kerr effect and micromagnetic simulations have been exploited to study the magnetization precession and spin-wave modes of the antidot lattice with varying lattice constant and in-plane orientation of the bias-magnetic field. A remarkable variation in the spin-wave modes with the orientation of in-plane bias magnetic field is found to be associated with the conversion of extended spin-wave modes to quantized ones and vice versa. The lattice constant also influences this variation in spin-wave spectra and spin-wave mode profiles. These observations are important for potential applications of the antidot lattices with triangular holes in future magnonic and spintronic devices.

Ultrafast magnetization dynamics in nanoscale two-dimensional Permalloy annular antidot lattices

2018 ◽  
Author(s):  
Nikita Porwal ◽  
Sucheta Mondal ◽  
Samiran Choudhury ◽  
Anulekha De ◽  
Jaivardhan Sinha ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Magnetization Dynamics ◽  
Ultrafast Magnetization

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.

Ultrafast magnetization dynamics of Nickel

1999 ◽  
Vol 68 (3) ◽  
pp. 505-510 ◽  
Author(s):  
J. Hohlfeld ◽  
J. Güdde ◽  
U. Conrad ◽  
O. Dühr ◽  
G. Korn ◽  
...  
Keyword(s):  
Magnetization Dynamics ◽  
Ultrafast Magnetization

Ultrafast magnetization dynamics of Mn-doped L10 FePt with spatial inhomogeneity

2020 ◽  
Vol 502 ◽  
pp. 166477
Author(s):  
Yuting Liu ◽  
Ute Bierbrauer ◽  
Cinja Seick ◽  
Sebastian T. Weber ◽  
Moritz Hofherr ◽  
...  
Keyword(s):  
Spatial Inhomogeneity ◽  
Magnetization Dynamics ◽  
Ultrafast Magnetization ◽  
Mn Doped

COLLECTIVE-DYNAMICS EFFECTS IN FISSION OF 256,258FM ISOTOPES

2008 ◽  
Vol 17 (01) ◽  
pp. 81-88 ◽  
Author(s):  
A. DOBROWOLSKI ◽  
H. GOUTTE ◽  
J.-F. BERGER
Keyword(s):  
Generating Functions ◽  
Time Dependent ◽  
Two Dimensional ◽  
Generator Coordinate Method ◽  
Coordinate Method ◽  
Collective Dynamics ◽  
Hartree Fock ◽  
Mass Distributions ◽  
Generator Coordinate ◽  
Induced Fission

A dynamical approach to the neutron-induced fission of 255,257 Fm isotopes based on the time-dependent generator-coordinate method is applied. As the generating functions the eigensolutions of the constrained Hartree-Fock-Bogoliubov method with the effective D1S Gogny force are used. The here presented collective-dynamics calculations in the two-dimensional collective space described by quadrupole and octupole moments allow to determine the fragment mass distributions of those two Fm isotopes.

Inductive measurement of ultrafast magnetization dynamics in thin-film Permalloy

1999 ◽  
Vol 85 (11) ◽  
pp. 7849-7862 ◽  
Author(s):  
T. J. Silva ◽  
C. S. Lee ◽  
T. M. Crawford ◽  
C. T. Rogers
Keyword(s):  
Thin Film ◽  
Magnetization Dynamics ◽  
Inductive Measurement ◽  
Ultrafast Magnetization
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