Results 21 to 30 of about 406 (125)

Spin current generated by thermally driven ultrafast demagnetization [PDF]

Nature Communications, 2014
Spin current is the key element for nanoscale spintronic devices. For ultrafast operation of such nano-devices, generation of spin current in picoseconds, a timescale that is difficult to achieve using electrical circuits, is highly desired. Here we show thermally driven ultrafast demagnetization of a perpendicular ferromagnet leads to spin ...
Gyung-Min, Choi, Byoung-Chul, Min, Kyung-Jin, Lee, David G, Cahill   +3 more
openaire   +2 more sources

Laser-Induced Forces on Atoms During Ultrafast Demagnetization

SSRN Electronic Journal, 2022
Laser-induced femtosecond demagnetization has attracted a broad attention as a possible candidate for information storage technology. However, whether or not lattice vibration directly participates in demagnetization has been highly controversial over a decade.
G.P. Zhang, Y.H. Bai
openaire   +2 more sources

Structural dynamics during laser-induced ultrafast demagnetization [PDF]

Physical Review B, 2017
The mechanism underlying femtosecond laser pulse induced ultrafast magnetization dynamics remains elusive despite two decades of intense research on this phenomenon. Most experiments focused so far on characterizing magnetization and charge carrier dynamics, while first direct measurements of structural dynamics during ultrafast demagnetization were ...
Jal, Emmanuelle, López-Flores, Victor, Pontius, Niko, Ferté, Tom, Bergeard, Nicolas, Boeglin, Christine, Vodungbo, Boris, Lüning, Jan, Jaouen, Nicolas   +8 more
openaire   +5 more sources

Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy [PDF]

Physical Review B, 2017
6 Figure, 2 ...
Fert , T., Bergeard, N., Le Guyader, L., Hehn, M., Malinowski, G., Terrier, E., Otero, E., Holldack, K., Pontius, N., Boeglin, C.   +9 more
openaire   +3 more sources

Giant Orbital Rashba–Edelstein Effect in Crystalline Cu2O/Cu Heterostructures

Advanced Materials, EarlyView.
An enhanced orbital Rashba–Edelstein effect is demonstrated in a crystalline Cu2O/Cu heterostructure, compared to naturally oxidized CuOx structures, highlighting the critical role of crystallinity and interface control in orbital torque generation. The resulting spin torque conductivity exceeds that of Pt, indicating the potential of orbital torque ...
San Ko, Jaimin Kang, Su Jae Kim, Hanhwi Jang, Do‐Kyeong Nam, Minseok Kang, Sunghoon Kim, Yeon Sik Jung, Se‐Young Jeong, Kab‐Jin Kim, Byong‐Guk Park   +10 more
wiley   +1 more source

Laser‐Induced Ultrafast Magnetic Phase Transition in 2D Van Der Waals Antiferromagnetic Heterostructures

Advanced Science, EarlyView.
In this work, ultrafast laser‐induced spin transfer and spin relaxation dynamics in 2D van der Waals antiferromagnetic CrI3/CrGeTe3 heterostructures are investigated. Laser excitation is demonstrated to induce pronounced interlayer nonequilibrium spin dynamics and ultrafast magnetic moment reconstruction, driving a transition from an antiferromagnetic (
Yang Wu, Fulu Zheng, San‐Dong Guo, Thomas Frauenheim, Zhaobo Zhou, Junjie He   +5 more
wiley   +1 more source

Ultrafast Dynamics of Spin Current and Electron Temperature in Spintronic Terahertz Emitters

Advanced Science, EarlyView.
This work quantifies optical‐pump‐induced THz transmission variations to reveal electron and lattice temperature dynamics and presents time‐resolved THz spectral maps for sub‐picosecond analysis. A 63 ± 8 fs time lag between THz emission and laser excitation is identified, serving as an intrinsic parameter limiting the upper frequency of spintronic THz
Yifan Wang, Zuanming Jin, Miao Cai, Zhiqiang Lan, Zhenjie Ge, Zheng Feng, Wei Tan, Alexei V. Balakin, Alexander P. Shkurinov, Yan Peng, Yiming Zhu   +10 more
wiley   +1 more source

Strain‐Preserving Transfer of Freestanding Oxide Membranes for Tunable Magnetic Anisotropy

Advanced Science, EarlyView.
An epoxy‐assisted exfoliation and transfer strategy circumvents the trade‐off between structural flexibility and strain tunability in freestanding oxide membranes. Epitaxial strain is effectively preserved, enabling versatile and robust control of magnetic anisotropy without sacrificing flexibility.
Jinfeng Zhang, Yuyue Zhao, Shouzhe Dong, Jingdi Lu, Qing Wang, Fang Xu, Ao Wang, Kunjie Dai, Yueming Huang, Zhengguo Liang, Qiming Lv, Houbing Huang, Wenbin Wu, Lingfei Wang   +13 more
wiley   +1 more source

Ultrafast demagnetizing fields from first principles [PDF]

Physical Review B, 2017
We examine the ultrafast demagnetization process of iron-based materials, namely, ${\mathrm{Fe}}_{6}$ clusters and bulk bcc Fe, with time-dependent spin-density functional theory (TDSDFT). The magnetization continuity equation is reformulated and the torque due to the spin-current divergence is written in terms of an effective time-dependent kinetic ...
Jacopo Simoni, Maria Stamenova, Stefano Sanvito   +2 more
openaire   +2 more sources

Aluminum‐Substituted Yttrium Iron Garnet Films With Perpendicular Anisotropy Grown on Silicon by Sputtering

Advanced Electronic Materials, EarlyView.
Ultrathin Al‐substituted YIG films with perpendicular magnetic anisotropy are sputter‐grown directly on Si/SiOx using an ultrathin AlOx buffer layer. Al diffusion reduces the saturation magnetization and stabilizes PMA via magnetoelastic effects. Pt/Al:YIG bilayers exhibit strong spin Hall magnetoresistance and efficient spin–orbit torque switching ...
Matteo Fettizio, Stefano Fedel, Saúl Estandía, Jesus Alejandro De Sousa, Can Onur Avci   +4 more
wiley   +1 more source