scholarly journals Сверхбыстрое лазерно-индуцированное управление магнитной анизотропией наноструктур

2021 ◽  
Vol 91 (12) ◽  
pp. 1848
Author(s):  
А.М. Калашникова ◽  
Н.Е. Хохлов ◽  
Л.А. Шелухин ◽  
А.В. Щербаков
Keyword(s):  
Magnetic Anisotropy ◽  
High Frequency ◽  
Spin Waves ◽  
Laser Pulses ◽  
Information Recording ◽  
Induced Magnetic Anisotropy ◽  
Resonance Frequencies ◽  
Short Laser Pulses ◽  
Waves Propagation ◽  
Distinct Branch

Employing short laser pulses with a duration below 100 fs for changing magnetic state of magnetically-ordered media has developed into a distinct branch of magnetism —femtomagnetism which aims at controlling magnetization at ultimately short timescales. Among plethora of femtomagnetic phenomena, there is a class related to impact of femtosecond pulses on magnetic anisotropy of materials and nanostructures which defines orientation of magnetization, magnetic resonance frequencies and spin waves propagation. We present a review of main experimental results obtained in this field. We consider basic mechanisms responsible for a laser-induced change of various anisotropy types: magnetocrystalline, magnetoelastic, interfacial, shape anisotropy, and discuss specifics of these processes in magnetic metals and dielectrics. We consider several examples and describe features of magnetic anisotropy changes resulting from ultrafast laser-induced heating, impact of laser-induced dynamic and quasistatic strains and resonant excitation of electronic states. We also discuss perspectives of employing various mechanisms of laser-induced magnetic anisotropy change for enabling processes prospective for developing devices. We consider precessional magnetization switching for opto-magnetic information recording, generation of high-frequency strongly localized magnetic excitations and fields for magnetic nanotomography and hybrid magnonics, as well as controlling spin waves propagation for optically-reconfigurable magnonics. We further discuss opportunities which open up in studies of ultrafast magnetic anisotropy changes because of using short laser pulses in infrared and terahertz ranges. 

Magnetic Anisotropy of Co Films Annealed by Laser Pulses

2008 ◽  
Vol 140 ◽  
pp. 69-74 ◽  
Author(s):  
J. Kisielewski ◽  
Kamil Postava ◽  
I. Sveklo ◽  
A. Nedzved ◽  
P. Trzciński ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
High Vacuum ◽  
Pulsed Laser ◽  
Perpendicular Magnetic Anisotropy ◽  
Laser Pulses ◽  
Ultra High Vacuum ◽  
Mica Substrate ◽  
Induced Magnetic Anisotropy ◽  
Coercivity Field ◽  
Pulsed Laser Beam

The magnetic properties of an ultrathin cobalt film were modified by a focused femtosecond pulsed laser beam. The Co wedge, with a thickness ranging from 0 to 2 nm, sandwiched by Au films was prepared using ultra-high vacuum magnetron sputtering on a mica substrate. The modifications of the laser induced magnetic anisotropy were investigated using magneto-optic Kerr microscopy and MFM/AFM techniques. The laser induces: (i) local reorientation of magnetization from an in-plane to a perpendicular state and (ii) an increase of the coercivity field. A corresponding increase of the perpendicular magnetic anisotropy is discussed considering an improvement of the Co/Au interfaces.

45° Induced Magnetic Anisotropy for Isotropic High-Frequency Permeability

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Noriyuki Sato ◽  
Amal El-Ghazaly ◽  
Robert M. White ◽  
Shan X. Wang
Keyword(s):  
Magnetic Anisotropy ◽  
High Frequency ◽  
Induced Magnetic Anisotropy

scholarly journals Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

2017 ◽  
Author(s):  
Tobias Peterseim ◽  
Martin Dressel
Keyword(s):  
Laser Intensity ◽  
Laser Pulses ◽  
Electron Systems ◽  
Double Exponential ◽  
Resonance Frequencies ◽  
Current Oscillations ◽  
Short Laser Pulses ◽  
Millisecond Range ◽  
Low Dimensional ◽  
A Charge

Below T_CO=157 K the quasi-one-dimensional charge-transfer salt (TMTTF)_2SbF_6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

scholarly journals Production of ion beams in high-power laser–plasma interactions and their applications

2004 ◽  
Vol 22 (1) ◽  
pp. 19-24 ◽  
Author(s):  
F. PEGORARO ◽  
S. ATZENI ◽  
M. BORGHESI ◽  
S. BULANOV ◽  
T. ESIRKEPOV ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Medical Physics ◽  
Ion Beam ◽  
Laser Pulses ◽  
Ion Beams ◽  
Laser Plasma Interactions ◽  
Physical Mechanisms ◽  
Short Laser Pulses ◽  
Laser Pulse Intensity ◽  
Target Design

Energetic ion beams are produced during the interaction of ultrahigh-intensity, short laser pulses with plasmas. These laser-produced ion beams have important applications ranging from the fast ignition of thermonuclear targets to proton imaging, deep proton lithography, medical physics, and injectors for conventional accelerators. Although the basic physical mechanisms of ion beam generation in the plasma produced by the laser pulse interaction with the target are common to all these applications, each application requires a specific optimization of the ion beam properties, that is, an appropriate choice of the target design and of the laser pulse intensity, shape, and duration.

Induced magnetic anisotropy of nickel-cobalt ferrites

1978 ◽  
Vol 21 (4) ◽  
pp. 509-512
Author(s):  
A. I. Drokin ◽  
A. V. Ivanova
Keyword(s):  
Magnetic Anisotropy ◽  
Nickel Cobalt ◽  
Cobalt Ferrites ◽  
Induced Magnetic Anisotropy
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