First Step Toward Ultrafast Nuclear-Spin Polarization: All-optical Control and Direct Detection of Ultrafast Electron-Spin Polarization Using Femtosecond Laser Pulses

2009 ◽  
Author(s):  
Takashi Nakajima ◽  
Yukari Matsuo ◽  
Tohru Kobayashi ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Spin Polarization ◽  
Electron Spin ◽  
Direct Detection ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Control ◽  
Electron Spin Polarization ◽  
Nuclear Spin Polarization ◽  
All Optical

scholarly journals Plasmonic layer-selective all-optical switching of magnetization with nanometer resolution

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
D. O. Ignatyeva ◽  
C. S. Davies ◽  
D. A. Sylgacheva ◽  
A. Tsukamoto ◽  
H. Yoshikawa ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Magnetic Recording ◽  
Optical Switching ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
All Optical ◽  
Polarization Axis ◽  
Linearly Polarized ◽  
All Optical Switching ◽  
Better Than

Abstract All-optical magnetization reversal with femtosecond laser pulses facilitates the fastest and least dissipative magnetic recording, but writing magnetic bits with spatial resolution better than the wavelength of light has so far been seen as a major challenge. Here, we demonstrate that a single femtosecond laser pulse of wavelength 800 nm can be used to toggle the magnetization exclusively within one of two 10-nm thick magnetic nanolayers, separated by just 80 nm, without affecting the other one. The choice of the addressed layer is enabled by the excitation of a plasmon-polariton at a targeted interface of the nanostructure, and realized merely by rotating the polarization-axis of the linearly-polarized ultrashort optical pulse by 90°. Our results unveil a robust tool that can be deployed to reliably switch magnetization in targeted nanolayers of heterostructures, and paves the way to increasing the storage density of opto-magnetic recording by a factor of at least 2.

scholarly journals Optical Control of Field-Emission Sites by Femtosecond Laser Pulses

2009 ◽  
Vol 103 (25) ◽  
Author(s):  
Hirofumi Yanagisawa ◽  
Christian Hafner ◽  
Patrick Doná ◽  
Martin Klöckner ◽  
Dominik Leuenberger ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Field Emission ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Control

scholarly journals Electron-spin polarization and its relaxation probed by femtosecond laser absorption

2005 ◽  
Vol 54 (2) ◽  
pp. 967
Author(s):  
Lai Tian-Shu ◽  
Liu Lu-Ning ◽  
Lei Liang ◽  
Shou Qian ◽  
Li Xi-Ying ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Spin Polarization ◽  
Electron Spin ◽  
Electron Spin Polarization ◽  
Laser Absorption

scholarly journals Magnetization Switching in the GdFeCo Films with In-Plane Anisotropy via Femtosecond Laser Pulses

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6406
Author(s):  
Daria O. Ignatyeva ◽  
Pavel O. Kapralov ◽  
Kiran Horabail Prabhakara ◽  
Hiroki Yoshikawa ◽  
Arata Tsukamoto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Metal Alloys ◽  
Magnetization Switching ◽  
Small Magnetic Field ◽  
Plane Anisotropy ◽  
All Optical ◽  
Out Of Plane

Ferrimagnetic rare-earth substituted metal alloys GdFeCo were shown to exhibit the phenomenon of all-optical magnetization switching via femtosecond laser pulses. All-optical magnetization switching has been comprehensively investigated in out-of-plane magnetized GdFeCo films; however, the films with the in-plane magnetic anisotropy have not yet been studied in detail. We report experimental observations of the magnetization switching of in-plane magnetized GdFeCo films by means of the femtosecond laser pulses in the presence of a small magnetic field of about 40 µT. The switching effect has a threshold both in the applied magnetic field and in the light intensity.

scholarly journals All optical control of magnetization in quantum confined ultrathin magnetic metals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Saeedeh Mokarian Zanjani ◽  
Muhammad Tahir Naseem ◽  
Özgür Esat Müstecaplıoğlu ◽  
Mehmet Cengiz Onbaşlı
Keyword(s):  
Energy Transfer ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulses ◽  
Optical Control ◽  
Coupling Coefficients ◽  
Magnetization Dynamics ◽  
Efficient Energy Transfer ◽  
Electron Model ◽  
Efficient Energy ◽  
All Optical

AbstractAll-optical control dynamics of magnetization in sub-10 nm metallic thin films are investigated, as these films with quantum confinement undergo unique interactions with femtosecond laser pulses. Our theoretical analysis based on the free electron model shows that the density of states at Fermi level (DOSF) and electron–phonon coupling coefficients (Gep) in ultrathin metals have very high sensitivity to film thickness within a few angstroms. We show that completely different magnetization dynamics characteristics emerge if DOSF and Gep depend on thickness compared with bulk metals. Our model suggests highly efficient energy transfer from femtosecond laser photons to spin waves due to minimal energy absorption by phonons. This sensitivity to the thickness and efficient energy transfer offers an opportunity to obtain ultrafast on-chip magnetization dynamics.

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