Article
Multidisciplinary Sciences
Cyril Leveille, Erick Burgos-Parra, Yanis Sassi, Fernando Ajejas, Valentin Chardonnet, Emanuele Pedersoli, Flavio Capotondi, Giovanni De Ninno, Francesco Maccherozzi, Sarnjeet Dhesi, David M. Burn, Gerrit van der Laan, Oliver S. Latcham, Andrey Shytov, Volodymyr V. Kruglyak, Emmanuelle Jal, Vincent Cros, Jean-Yves Chauleau, Nicolas Reyren, Michel Viret, Nicolas Jaouen
Summary: This study investigates the ultrafast dynamics of chiral domain walls and observes the emergence of a transient spin chiral texture on the walls. The research findings suggest that the spin texture of the domain walls changes shortly after optical pumping.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Eyal Bahar, Uri Arieli, Maayan Vizner Stern, Haim Suchowski
Summary: By shaping the pulse and aligning its phase with the plasmon-resonance, the coherent control of photo-induced ultrafast dynamics in metallic nanostructures can enhance the second-order nonlinear emission. This study highlights the crucial role of coherent electronic nature and provides a theoretical framework for optimizing pulse shapes for enhanced nonlinear emission.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Peng Peng, Yonghao Mi, Marianna Lytova, Mathew Britton, Xiaoyan Ding, A. Yu. Naumov, P. B. Corkum, D. M. Villeneuve
Summary: By generating quantum coherence in the ground electronic state of hydrogen molecules, we are able to control the absorption spectrum, making it negative at 12 eV, which is the optical gain. These findings offer new insights into controlling spectral lineshapes and pave the way for achieving lasing without inversion in the XUV spectral range.
Article
Engineering, Electrical & Electronic
Xianzhe Chen, Hua Bai, Yuchen Ji, Yongjian Zhou, Liyang Liao, Yunfeng You, Wenxuan Zhu, Qian Wang, Lei Han, Xiaoyang Liu, Ang Li, Xiaodong Han, Jia Yin, Xufeng Kou, Feng Pan, Cheng Song
Summary: The antiferromagnetic moments in the topological insulator/antiferromagnetic insulator bilayer can be reversibly switched using electrical currents at room temperature, with a critical current density that is one order of magnitude smaller than that in heavy-metal/magnetic insulator systems. This finding has potential applications in building low-power, high-speed memory devices.
NATURE ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Ke Wang, Gang Xu, Fei Gao, He Liu, Rong-Long Ma, Xin Zhang, Zhanning Wang, Gang Cao, Ting Wang, Jian-Jun Zhang, Dimitrie Culcer, Xuedong Hu, Hong-Wen Jiang, Hai-Ou Li, Guang-Can Guo, Guo-Ping Guo
Summary: Hole-spin qubits in germanium show promise for rapid, all-electrical qubit control. The authors demonstrate ultrafast single-spin manipulation in a hole-based double quantum dot in a germanium hut wire, with a record Rabi frequency exceeding 540 MHz. These results suggest the potential for ultrafast coherent control of hole spin qubits to meet the requirements for scalable quantum information processing.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Alexey Melnikov, Liane Brandt, Niklas Liebing, Mirko Ribow, Ingrid Mertig, Georg Woltersdorf
Summary: The emission of femtosecond spin current pulses at Fe/Au interfaces was studied, with direct measurements using optical second harmonic generation. A simple model and superdiffusive spin transport description were used to extract key parameters, and the variation of spin current pulse shape with increasing Fe emitter layer thickness was analyzed.
Article
Chemistry, Multidisciplinary
Leonid A. Shelukhin, Rashid R. Gareev, Vladyslav Zbarsky, Jakob Walowski, Markus Munzenberg, Nikolay A. Pertsev, Alexandra M. Kalashnikova
Summary: This study presents an experimental investigation of laser-induced magnetization dynamics in a CoFeB/MgO/CoFeB MTJ. The results show that a femtosecond laser pulse can induce magnetization precession in the thinner CoFeB layer and the precession frequency increases nonlinearly with increasing pump fluence. Additionally, the gradual quenching of interfacial magnetic anisotropy with increasing fluence is explained by laser-induced heating of the MTJ.
Article
Physics, Applied
Junxiao Yu, Haijuan Zhang, Zefang Lv, Conglong Chen, Runze Li, Xiaofang Zhai, Jie Chen, Peter M. Rentzepis
Summary: This study investigates the propagation of coherent longitudinal acoustic phonons (CLAPs) in crystal materials on thin-film interfaces and heterojunctions using ultrafast optical reflectivity and ultrafast x-ray diffraction measurements. The results show that acoustic impedance matching facilitates efficient propagation of CLAPs between different thin films and substrates, while impedance mismatch partially confines CLAPs within the film.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
S. Shallcross, Q. Z. Li, J. K. Dewhurst, S. Sharma, P. Elliott
Summary: By employing hybrid laser pulses combining linearly and circularly polarized light, this study demonstrates the excitation of free carriers with chosen spin at an arbitrary k-vector in the Brillouin zone of WSe2. The linear terahertz component induces adiabatic intra-band evolution to link an arbitrary point k(0) to a high symmetry K point in a single pulse cycle, while the circularly polarized component induces interband transitions at one of the two inequivalent K points. The findings pave the way for preparation of excited states with arbitrary momentum and spin specificity at ultrafast timescales.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Hongdan Zhang, Xiwang Liu, Facheng Jin, Ming Zhu, Shidong Yang, Wenhui Dong, Xiaohong Song, Weifeng Yang
Summary: By controlling the laser fields interacting with metal nanotips, high harmonic generation and an ultrabroad supercontinuum in the extreme ultraviolet region can be achieved, potentially leading to the generation of single attosecond pulses.
CHINESE PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yongming Luo, Changjiang Liu, Hilal Saglam, Yi Li, Wei Zhang, Steven S-L Zhang, John E. Pearson, Brandon Fisher, Tiejun Zhou, Anand Bhattacharya, Axel Hoffmann
Summary: This study investigates the role of uncompensated sublattices at the top and bottom surfaces of an antiferromagnetic Cr2O3 film in determining the symmetry of spin Seebeck signals. Experimental data combined with micromagnetic simulations provide fundamental insights for understanding the generation of spin Seebeck signals in antiferromagnetic materials.
Article
Engineering, Electrical & Electronic
Vadym Zayets
Summary: The spin Hall effect generates a magnetic field at the boundary of a nanomagnet, which can be used to alter its magnetization. By modulating the magnetic field in resonance with the magnetization precession and meeting the conditions of parametric resonance, the magnetization of the nanomagnet can be reversed, allowing for optimization of the recording mechanism and reduction of energy consumption in MRAM.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Optics
Johann A. Preuss, Daniel Groll, Robert Schmidt, Thilo Hahn, Pawel Machnikowski, Rudolf Bratschitsch, Tilmann Kuhn, Steffen Michaelis De Vasconcellos, Daniel Wigger
Summary: This study demonstrates coherent state manipulation of a single color center in hexagonal boron nitride (hBN) and investigates the coupling between the electronic system and phonons. The results reveal the application of quantum control techniques in both phonon-assisted and resonant excitation, paving the way for ultrafast phonon quantum state control on the nanoscale and hybrid quantum technologies.
Article
Materials Science, Multidisciplinary
Reza Rouzegar, Liane Brandt, Lukas Nadvornik, David A. Reiss, Alexander L. Chekhov, Oliver Gueckstock, Chihun In, Martin Wolf, Tom S. Seifert, Piet W. Brouwer, Georg Woltersdorf, Tobias Kampfrath
Summary: Laser-induced terahertz spin transport and ultrafast demagnetization are two important phenomena in femtomagnetism and terahertz spintronics. This study found that the rate of ultrafast demagnetization in a ferromagnetic metal film and the time evolution of terahertz spin transport from the film to an adjacent normal-metal layer exhibit the same pattern. This suggests that both phenomena are driven by the same force determined by the state of the ferromagnet.
Article
Optics
Daria Kolbasova, Maximilian Hartmann, Rui Jin, Alexander Blaettermann, Christian Ott, Sang-Kil Son, Thomas Pfeifer, Robin Santra
Summary: This study investigates the application of attosecond transient absorption spectroscopy in characterizing inner-shell-excited systems. The experimental setup involves preparing wave packets with an attosecond XUV pulse and probing them with a femtosecond NIR pulse to study coherent electron dynamics in core-excited xenon atoms. The theoretical analysis shows that the additional influence of an NIR dressing field on the transient absorption spectrum is substantial, highlighting the importance of precise characterization of the NIR pulse for qualitative and quantitative comparisons with experimental results.
Article
Biochemistry & Molecular Biology
Abdul Rahman Mohtasebzadeh, Longfei Ye, Thomas M. Crawford
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2015)
Article
Chemistry, Multidisciplinary
Longfei Ye, Tanner Pearson, Cory Dolbashian, Philip Pstrak, A. R. Mohtasebzadeh, Ben Fellows, O. Thompson Mefford, Thomas M. Crawford
ADVANCED FUNCTIONAL MATERIALS
(2016)
Article
Engineering, Chemical
William Glasgow, Ben Fellows, Bin Qi, Taghi Darroudi, Christopher Kitchens, Longfei Ye, Thomas M. Crawford, O. Thompson Mefford
Article
Multidisciplinary Sciences
L. Ye, T. Pearson, Y. Cordeau, O. T. Mefford, T. M. Crawford
SCIENTIFIC REPORTS
(2016)
Article
Nanoscience & Nanotechnology
Bryan L. Chavez, Kevin C. Sosnowski, Matthew J. Bauer, Maeve A. K. Budi, Jennifer S. Andrew, Thomas M. Crawford
Article
Physics, Applied
L. Ye, B. Qi, T. Pearson, Y. Cordeau, O. T. Mefford, T. M. Crawford
JOURNAL OF APPLIED PHYSICS
(2014)
Article
Chemistry, Physical
Steven L. Saville, Bin Qi, Jonathon Baker, Roland Stone, Robert E. Camley, Karen L. Livesey, Longfei Ye, Thomas M. Crawford, O. Thompson Mefford
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2014)
Article
Physics, Applied
C. Dolbashian, B. L. Chavez, M. Bauer, M. Budi, J. S. Andrew, T. M. Crawford
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Zichun Yan, Sara FitzGerald, Thomas M. Crawford, O. Thompson Mefford
Summary: The study investigates the oxidation of FeO particles to Fe3O4 particles and demonstrates the feasibility of the method. The experimental results show that the 20 nm oxidized particles exhibit good magnetic properties and absorption rate.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Abdul Rahman Mohtasebzadeh, Jonathon C. Davidson, Karen L. Livesey, Thomas M. Crawford
Summary: This study demonstrates the self-assembly of colloidal magnetite nanoparticles onto a disk drive medium under the influence of magnetic field gradients, resulting in hexatic ordering. Langevin dynamics simulations reveal the importance of the medium's magnetic properties in determining the assembly location. Additionally, slight changes in solvent polarity offer an alternative mechanism to precisely tune the self-assembly process.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Artek R. Chalifour, Jonathon C. Davidson, Nicholas R. Anderson, Thomas M. Crawford, Karen L. Livesey
Summary: The magnetic relaxation time of single-domain nanoparticles is crucial for characterizing their properties, such as anisotropy and behavior in applied fields. Brown's famous result, although overestimating the relaxation time, is commonly used to extract nanoparticle parameters. Various analytic expressions for relaxation time do a reasonable job, as long as a full calculation for the attempt time is used instead of the commonly used estimate tau(0) around 1 ns.
Article
Materials Science, Multidisciplinary
Zichun Yan, Sara FitzGerald, Thomas M. Crawford, O. Thompson Mefford
Summary: This study successfully synthesized multi-dopant ferrite nanoparticles by combining the 'Extended LaMer' and seed-mediated growth techniques, finding that the particle size was mainly determined by the seeding stage, while the magnetic properties were more affected by the dripping stage.
JOURNAL OF PHYSICS-MATERIALS
(2021)