scholarly journals Ultrafast optical excitation of coherent magnons in antiferromagnetic NiO

2017 ◽  
Vol 95 (17) ◽  
Author(s):  
Christian Tzschaschel ◽  
Kensuke Otani ◽  
Ryugo Iida ◽  
Tsutomu Shimura ◽  
Hiroaki Ueda ◽  
...  
Keyword(s):  
Optical Excitation ◽  
Ultrafast Optical

Photo-modulated dynamic competition between metallic and insulating phases in a layered manganite

2014 ◽  
Vol 1636 ◽  
Author(s):  
Yuelin Li ◽  
Donald Walko ◽  
Qing’an Li ◽  
Yaohua Liu ◽  
Stephan Rosenkranz ◽  
...  
Keyword(s):  
Optical Excitation ◽  
Superlattice Reflection ◽  
Metallic Phase ◽  
Local Competition ◽  
Ultrafast Optical ◽  
Laser Fluences ◽  
Show Evidence ◽  
Jahn Teller ◽  
Insulating Phase ◽  
Reflection Intensity

ABSTRACTWe show evidence that the competition between the antiferromagnetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered manganite, LaSr2Mn2O7, can be manipulated using ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller superlattice reflection, the indicator of the formation of charge and orbital order, was measured at different laser fluences. The laser-induced change in the Jahn-Teller reflection intensity shows a reversal of sign between earlier (∼10 ns) and later (∼150 ns) times during the relaxation of the sample. This is consistent with a physics picture whereby the laser excitation modulates the local competition between the metallic and the insulating phases.

Control of coherent magnetization precession in GaMnAs by ultrafast optical excitation

2008 ◽  
Vol 5 (8) ◽  
pp. 2637-2640 ◽  
Author(s):  
J. Qi ◽  
Y. Xu ◽  
X. Liu ◽  
J. K. Furdyna ◽  
I. E. Perakis ◽  
...  
Keyword(s):  
Optical Excitation ◽  
Ultrafast Optical ◽  
Magnetization Precession

scholarly journals Ultrafast Modulation of Magnetization Dynamics in Ferromagnetic (Ga, Mn)As Thin Films

2018 ◽  
Vol 8 (10) ◽  
pp. 1880 ◽  
Author(s):  
Hang Li ◽  
Xinhui Zhang ◽  
Xinyu Liu ◽  
Margaret Dobrowolska ◽  
Jacek Furdyna
Keyword(s):  
Magnetic Anisotropy ◽  
Spin Dynamics ◽  
Optical Excitation ◽  
Laser Pulses ◽  
Time Resolved ◽  
Ultrafast Optical ◽  
Optical Effects ◽  
Out Of Plane ◽  
Linearly Polarized ◽  
Magnetization Precession

Magnetization precession induced by linearly polarized optical excitation in ferromagnetic (Ga,Mn)As was studied by time-resolved magneto-optical Kerr effect measurements. The superposition of thermal and non-thermal effects arising from the laser pulses complicates the analysis of magnetization precession in terms of magnetic anisotropy fields. To obtain insight into these processes, we investigated compressively-strained thin (Ga,Mn)As films using ultrafast optical excitation above the band gap as a function of pulse intensity. Data analyses with the gyromagnetic calculation based on Landau-Lifshitz-Gilbert equation combined with two different magneto-optical effects shows the non-equivalent effects of in-plane and out-of-plane magnetic anisotropy fields on both the amplitude and the frequency of magnetization precession, thus providing a handle for separating the effects of non-thermal and thermal processes in this context. Our results show that the effect of photo-generated carriers on magnetic anisotropy constitutes a particularly effective mechanism for controlling both the frequency and amplitude of magnetization precession, thus suggesting the possibility of non-thermal manipulation of spin dynamics through pulsed laser excitations.

Time-resolved thermal expansion of an STM tip after ultrafast optical excitation

1998 ◽  
Author(s):  
R. Huber ◽  
M. Koch ◽  
M. Perner ◽  
W. Spirkl ◽  
J. Feldmann
Keyword(s):  
Thermal Expansion ◽  
Optical Excitation ◽  
Time Resolved ◽  
Ultrafast Optical

Breaking Metals with Ultrafast Optical Excitation

2000 ◽  
Vol 11 (12) ◽  
pp. 47 ◽  
Author(s):  
Chunlei Guo ◽  
George Rodriguez ◽  
Ahmed Lobad ◽  
Antoinette J. Taylor
Keyword(s):  
Optical Excitation ◽  
Ultrafast Optical
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