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Autore: Grafiati
Pubblicato: 8 giugno 2024

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1

Gao, Shihan, Runji Cai, Wanjie Xiong e Chudong Xu. "Influence of a damping parameter on helicity-independent all-optical switching". Optics Express 29, n. 20 (24 settembre 2021): 32535. http://dx.doi.org/10.1364/oe.435160.

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2

Liu, Donglin, Jiawen Weng, Xinyu Song, Wenxi Cai, Suiyan Tan e Chudong Xu. "Ultrafast write-read event in helicity-independent all-optical switching of GdFeCo". Journal of Magnetism and Magnetic Materials 592 (febbraio 2024): 171824. http://dx.doi.org/10.1016/j.jmmm.2024.171824.

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3

Fan, Xiaofei, e Xiaoyang Lin. "Thermal impact on ultrafast helicity independent all-optical switching of GdxCo100-x". Journal of Physics: Conference Series 2230, n. 1 (1 marzo 2022): 012025. http://dx.doi.org/10.1088/1742-6596/2230/1/012025.

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Abstract (sommario):
Abstract Ultrafast all-optical switching by single femtosecond laser pulse has recently been considered as one of the most potential technologies for the application on high-speed and energy efficient memory device. Here, to ensure such a sophisticated technology to be applicable to more complex environments, we report the dependence of all-optical switching of the ferrimagnet, GdCo, on the ambient temperature. Through heating the GdCo film up to 380 K, we demonstrate the distinct magnetic behaviours and the critical laser fluences of all-optical switching under different composition of Gd. It is found that the thermal stability for AOS will be significantly improved when there are more rare-earth elements, Gd in GdCo. This work provides a deep insight into the thermal effect on helicity independent all-optical switching and will optimize the application of ultrafast technology on the spintronic devices and magnetic memories.
4

Zimnyakova, Polina E., Daria O. Ignatyeva, Andrey N. Kalish, Xiufeng Han e Vladimir I. Belotelov. "Plasmonic dichroism and all-optical magnetization switching in nanophotonic structures with GdFeCo". Optics Letters 47, n. 23 (15 novembre 2022): 6049. http://dx.doi.org/10.1364/ol.472046.

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Abstract (sommario):
We report on a phenomenon of plasmonic dichroism observed in magnetic materials with transverse magnetization under excitation of surface plasmon polariton waves. The effect originates from the interplay of the two magnetization-dependent contributions to the material absorption, both of which are enhanced under plasmon excitation. Plasmonic dichroism is similar to circular magnetic dichroism, which is at the base of all-optical helicity-dependent switching (AO-HDS) but observed for linearly polarized light, and the dichroism acts upon in-plane magnetized films, where AO-HDS does not take place. We show by electromagnetic modeling that laser pulses exciting counter-propagating plasmons can be used to write +M or −M states in a deterministic way independent of the initial magnetization state. The presented approach applies to various ferrimagnetic materials with in-plane magnetization, exhibiting the phenomenon of all-optical switching of a thermal nature and broadens the horizons of their applications in data storage devices.
5

Huang, Haozhe, Haiwei Wang, Zhihao Zeng, Rongyao Wang, Xinyu Zhang, Weiming Cheng e Changsheng Xie. "Investigation on the Effect of Femtosecond Laser Induced Spin Transfer Torque of GdFeCo Alloy". Applied Sciences 11, n. 14 (15 luglio 2021): 6501. http://dx.doi.org/10.3390/app11146501.

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Abstract (sommario):
All-optical magnetic switching (AOS) provides a novel approach to improve writing ability and energy efficiency compared to those utilized in the mainstream magnetic data storage products. Rare earth-transition metals (RE-TM) exhibit extremely fast magnetization switching induced by one single incident linearly polarized laser pulse; however, the mechanism is still ambiguous. Here, we show by atomistic spin simulation that the laser induced spin transfer torque dominates the magnetization reversal of Fe sublattice in Gd25Fe75 alloy, and that the switching speed of Gd25Fe75 alloy is relevant to the amount of spin current. This implies that a possible helicity independent mechanism underlies the RE-TM alloy AOS process. We also find that the greater the spin current density the faster the magnetization switching, and the time magnetization reversal of Gd and Fe takes is also affected by the spin current density.
6

Davies, C. S., J. H. Mentink, A. V. Kimel, Th Rasing e A. Kirilyuk. "Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys". Journal of Magnetism and Magnetic Materials, agosto 2022, 169851. http://dx.doi.org/10.1016/j.jmmm.2022.169851.

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7

Peng, Y., G. Malinowski, J. Gorchon, J. Hohlfeld, D. Salomoni, L. D. Buda-Prejbeanu, R. C. Sousa et al. "Single-Shot Helicity-Independent All-Optical Switching in Co/Ho Multilayers". Physical Review Applied 20, n. 1 (31 luglio 2023). http://dx.doi.org/10.1103/physrevapplied.20.014068.

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8

Wei, Jiaqi, Boyu Zhang, Michel Hehn, Wei Zhang, Gregory Malinowski, Yong Xu, Weisheng Zhao e Stéphane Mangin. "All-optical Helicity-Independent Switching State Diagram in Gd - Fe - Co Alloys". Physical Review Applied 15, n. 5 (28 maggio 2021). http://dx.doi.org/10.1103/physrevapplied.15.054065.

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9

Gweha Nyoma, Danny Petty, Maxime Vergès, Michel Hehn, Daniel Lacour, Julius Hohlfeld, Sebastiaan van Dijken, Grégory Malinowski, Stéphane Mangin e François Montaigne. "Size effect on single pulse all-optical helicity-independent switching in GdFeCo disk arrays". Applied Physics Letters 123, n. 5 (31 luglio 2023). http://dx.doi.org/10.1063/5.0150250.

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Abstract (sommario):
We experimentally demonstrate single pulse toggle switching of the magnetization of GdFeCo disks with perpendicular to film plane anisotropy, which diameter ranges from 3 μm to 400 nm using 35 fs linearly polarized laser pulses. Two different magnetic states can be observed depending on the laser fluence: either a deterministic switching of the disk magnetization or a randomly oriented disk. We report that the fluence required to observe both magnetic states show a non-monotonic behavior with disk diameter and that the smallest disks require the lowest minimum fluence for achieving single pulse all-optical helicity-independent switching. Different evolution of the fluence thresholds for both phenomenon as a function of the disk size is observed and discussed.
10

Sait, Connor R. J., Maciej Dąbrowski, Jade N. Scott, William R. Hendren, David G. Newman, Alpha T. N'Diaye, Christoph Klewe et al. "Unidirectional multipulse helicity-independent all-optical switching in [Ni/Pt] based synthetic ferrimagnets". Physical Review B 109, n. 13 (11 aprile 2024). http://dx.doi.org/10.1103/physrevb.109.134417.

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11

P., Syam Prasad, e Jyoti Ranjan Mohanty. "Single shot all-optical switching in amorphous TbCo and the role of element specific damping on helicity-independent all-optical switching". Journal of Magnetism and Magnetic Materials, aprile 2023, 170701. http://dx.doi.org/10.1016/j.jmmm.2023.170701.

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12

Gorchon, J., R. B. Wilson, Y. Yang, A. Pattabi, J. Y. Chen, L. He, J. P. Wang, M. Li e J. Bokor. "Role of electron and phonon temperatures in the helicity-independent all-optical switching of GdFeCo". Physical Review B 94, n. 18 (4 novembre 2016). http://dx.doi.org/10.1103/physrevb.94.184406.

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13

Gao, Yang, Chong Wang e Di Xiao. "Frequency-independent optical spin injection in Weyl semimetals". SciPost Physics Core 7, n. 1 (22 gennaio 2024). http://dx.doi.org/10.21468/scipostphyscore.7.1.002.

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Abstract (sommario):
We demonstrate that in Weyl semimetals, the momentum-space helical spin texture can couple to the chirality of the Weyl node to generate a frequency-independent optical spin injection. This frequency-independence is rooted in the topology of the Weyl node. Since the helicity and the chirality are always locked for Weyl nodes, the injected spin from a pair of Weyl nodes always add up, implying no symmetry requirements for Weyl semimetals. Finally, we show that such frequency-independent spin injection is robust against multiband corrections and lattice-regularization effect and capable of realizing all-optical magnetization switching in the THz regime.
14

Ceballos, Alejandro, Akshay Pattabi, Amal El-Ghazaly, Sergiu Ruta, Christian P. Simon, Richard F. L. Evans, Thomas Ostler et al. "Role of element-specific damping in ultrafast, helicity-independent, all-optical switching dynamics in amorphous (Gd,Tb)Co thin films". Physical Review B 103, n. 2 (25 gennaio 2021). http://dx.doi.org/10.1103/physrevb.103.024438.

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15

Zhang, Wei, Jun Xiao Lin, Tian Xun Huang, Gregory Malinowski, Michel Hehn, Yong Xu, Stéphane Mangin e Weisheng Zhao. "Role of spin-lattice coupling in ultrafast demagnetization and all optical helicity-independent single-shot switching in Gd1−x−yTbyCox alloys". Physical Review B 105, n. 5 (11 febbraio 2022). http://dx.doi.org/10.1103/physrevb.105.054410.

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