Littérature scientifique sur le sujet « All-optical helicity-dependent switching »
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Articles de revues sur le sujet "All-optical helicity-dependent switching"
Mangin, S., M. Gottwald, C.-H. Lambert, D. Steil, V. Uhlíř, L. Pang, M. Hehn et al. « Engineered materials for all-optical helicity-dependent magnetic switching ». Nature Materials 13, no 3 (16 février 2014) : 286–92. http://dx.doi.org/10.1038/nmat3864.
Texte intégralEl Hadri, Mohammed Salah, Michel Hehn, Grégory Malinowski et Stéphane Mangin. « Materials and devices for all-optical helicity-dependent switching ». Journal of Physics D : Applied Physics 50, no 13 (2 mars 2017) : 133002. http://dx.doi.org/10.1088/1361-6463/aa5adf.
Texte intégralCheng, Feng, Zhidong Du, Xinjun Wang, Ziqiang Cai, Lin Li, Chuangtang Wang, Abdelkrim Benabbas et al. « All‐Optical Helicity‐Dependent Switching in Hybrid Metal–Ferromagnet Thin Films ». Advanced Optical Materials 8, no 13 (4 mai 2020) : 2000379. http://dx.doi.org/10.1002/adom.202000379.
Texte intégralZhang, Longlong, et Yuying Hao. « Helicity-dependent all-optical switching based on the self-trapped triplet excitons ». Applied Physics Letters 118, no 9 (1 mars 2021) : 093301. http://dx.doi.org/10.1063/5.0035217.
Texte intégralEl Hadri, M. S., P. Pirro, C. H. Lambert, N. Bergeard, S. Petit-Watelot, M. Hehn, G. Malinowski et al. « Electrical characterization of all-optical helicity-dependent switching in ferromagnetic Hall crosses ». Applied Physics Letters 108, no 9 (29 février 2016) : 092405. http://dx.doi.org/10.1063/1.4943107.
Texte intégralSchubert, C., A. Hassdenteufel, P. Matthes, J. Schmidt, M. Helm, R. Bratschitsch et M. Albrecht. « All-optical helicity dependent magnetic switching in an artificial zero moment magnet ». Applied Physics Letters 104, no 8 (24 février 2014) : 082406. http://dx.doi.org/10.1063/1.4866803.
Texte intégralJiang, Caijian, Donglin Liu, Xinyu Song, Yifeng Wu, Hai Li et Chudong Xu. « Single-shot all-optical switching of magnetization in TbFe ». Journal of Physics D : Applied Physics 57, no 19 (15 février 2024) : 195001. http://dx.doi.org/10.1088/1361-6463/ad26ef.
Texte intégralWang, Sicong, Chen Wei, Yuanhua Feng, Yaoyu Cao, Haiwei Wang, Weiming Cheng, Changsheng Xie et al. « All-optical helicity-dependent magnetic switching by first-order azimuthally polarized vortex beams ». Applied Physics Letters 113, no 17 (22 octobre 2018) : 171108. http://dx.doi.org/10.1063/1.5051576.
Texte intégralLiao, Jung‐Wei, Pierre Vallobra, Liam O'Brien, Unai Atxitia, Victor Raposo, Dorothée Petit, Tarun Vemulkar et al. « Controlling All‐Optical Helicity‐Dependent Switching in Engineered Rare‐Earth Free Synthetic Ferrimagnets ». Advanced Science 6, no 24 (14 octobre 2019) : 1901876. http://dx.doi.org/10.1002/advs.201901876.
Texte intégralHassdenteufel, Alexander, Birgit Hebler, Christian Schubert, Andreas Liebig, Martin Teich, Manfred Helm, Martin Aeschlimann, Manfred Albrecht et Rudolf Bratschitsch. « Thermally Assisted All-Optical Helicity Dependent Magnetic Switching in Amorphous Fe100-xTbxAlloy Films ». Advanced Materials 25, no 22 (25 avril 2013) : 3122–28. http://dx.doi.org/10.1002/adma.201300176.
Texte intégralThèses sur le sujet "All-optical helicity-dependent switching"
Lambert, Charles-Henri. « All-Optical Helicity dependent switching effect in magnetic thin films ». Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0091/document.
Texte intégralThe possibilities of modifying magnetization without applied magnetic fields have attracted growing attention over the past fifteen years. The low-power manipulation of magnetization, preferably at ultrashort timescales, has become a fundamental challenge with implications for future magnetic information memory and storage technologies. In particular the interplay of laser and magnetism recently discovered by Stanciu et al. opens up new way for light to be used as an excitation and a probe of magnetic materials. A description of the current models and frameworks developed in the field requires a careful look at the different parameters involved through the interaction of ultrafast lasers and magnetic materials. The specific and complex interplay between heat and angular momentum transfer is highlighted in order to discuss the role of each of them in the phenomena observed. The timescales of the different interactions responsible for the final state of magnetization are presented and will impact the way the system recovery after a laser excitation. Besides we were interested in exploring the relation between the material parameters such as anisotropy, ordering temperature and exchange coupling on the final state of magnetization obtained with a laser. Indeed thanks to the many different magnetism classes existing the magnetic parameters can be tuned widely and in a controlled manner. Our imaging setup then is able to probe the optical characteristics and domain stability after the laser excitation. We finally demonstrated that all-optical helicity-dependent switching (AO-HDS) can be observed not only in selected rare earth-transition metal (RE-TM) alloy films but also in a much broader variety of materials, including RE-TM alloys, multilayers and heterostructures. We further show that RE-free Co-Ir-based synthetic ferrimagnetic heterostructures designed to mimic the magnetic properties of RE-TM alloys also exhibit AO-HDS. We further developed the optical control of ferromagnetic materials ranging from magnetic thin films to multilayers and even granular films being explored for ultra-high-density magnetic recording. Our finding shows that optical control of magnetic materials is a much more general phenomenon than previously assumed and may have a major impact on data memory and storage industries through the integration of optical control of ferromagnetic bits
Hadri, Mohammed Salah El. « Magnetization reversal mechanism leading to all-optical helicity-dependent switching ». Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0107/document.
Texte intégralThe control of magnetization without external magnetic fields is an emergent field of research due to the prospect of impacting many technological applications such as magnetic recording and spintronics. In 2007, Stanciu et al. discovered an intriguing new possibility to switch magnetization in a ferrimagnetic GdFeCo alloy film using femtosecond laser pulses. This all-optical switching of magnetization had long been restricted to GdFeCo alloys, though it turned out to be a more general phenomenon for a variety of ferromagnetic and ferromagnetic materials. This discovery paved the way for an integration of the all-optical writing in storage industries. Nevertheless, the theoretical models explaining the switching in GdFeCo alloys films do not appear to apply in the other materials, thus questioning the uniqueness of the microscopic origin of all-optical switching. In this thesis, we have investigated the response of femtosecond laser pulses in ferrimagnetic alloys and ferromagnetic multilayers to the action of femtosecond laser pulses, in order to elucidate several aspects of the all-optical switching mechanism. We have experimentally studied the magnetic parameters governing the all-optical switching. We showed that the observation of all-optical switching requires magnetic domains larger than the laser spot size during the cooling process; such a criterion is common for both ferrimagnets and ferromagnets. Furthermore, we have investigated the integration of all-optical switching in spintronic devices via the anomalous Hall effect. Through a time-dependent electrical investigation of the magnetization in Hall crosses, we distinguished between two types of all-optical switching mechanisms. The first type is the single-pulse helicity-independent switching in ferrimagnetic GdFeCo alloy films as shown in previous studies, whereas the second is a two regimes helicity-dependent switching in both ferrimagnetic TbCo alloys and ferromagnetic Co/Pt multilayers. The latter consists in a step-like helicity-independent multiple-domain formation followed by a helicity-dependent remagnetization on several tens of milliseconds
Quessab, Yassine. « Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films ». Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0116/document.
Texte intégralOver the past decade, the demand for an even higher capacity to store data has been gradually increasing. To achieve ultrafast and ultrahigh density magnetic data storage, low-power methods to manipulate the magnetization without applying an external magnetic field has attracted growing attention. The possibility to deterministically reverse the magnetization with only circularly polarized light was evidenced in multiple ferri- and ferro-magnetic materials. This phenomenon was called helicity-dependent all-optical switching (HD-AOS). In ferromagnets, it was demonstrated that HD-AOS was a cumulative and multishot process with a helicity-independent demagnetization followed by a helicity-dependent magnetization recovery. Yet, the microscopic mechanism of this helicity-dependent remagnetization remained highly debated. In this thesis, we investigated the magnetization reversal mechanism of all-optical switching in ferromagnetic materials. To explore a potential switching process through domain nucleation and domain wall (DW) propagation, we studied the response of a DW upon femto- or pico-second laser irradiation in Co/Pt thin films that exhibit HD-AOS. We reported helicity-dependent all-optical domain wall motion. We demonstrated that it results from the balance of three contributions: the temperature gradient due to the laser heating, the helicity effect and the pinning effects. By measuring the magnetic circular dichroism, a purely thermal mechanism of the laser-induced DW motion appears to be excluded. Furthermore, we examined the size effects in AOS in Co/Pt films patterned into microdots with a diameter between 10 and 3 μm. This allowed us to explore the role of the dipolar field in the switching mechanism. We discovered that a larger number of laser pulses was required to reverse the magnetization of a microdot compared to the continuous film. This indicated that the dipolar field actually eases the magnetization reversal in the full film. Thus, AOS is less energy-efficient in patterned films, hence making Pt/Co/Pt multilayers not an ideal candidate for integrating AOS in spintronic devices
Quessab, Yassine. « Mechanism and size effects of helicity-dependent all-optical magnetization switching in ferromagnetic thin films ». Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0116.
Texte intégralOver the past decade, the demand for an even higher capacity to store data has been gradually increasing. To achieve ultrafast and ultrahigh density magnetic data storage, low-power methods to manipulate the magnetization without applying an external magnetic field has attracted growing attention. The possibility to deterministically reverse the magnetization with only circularly polarized light was evidenced in multiple ferri- and ferro-magnetic materials. This phenomenon was called helicity-dependent all-optical switching (HD-AOS). In ferromagnets, it was demonstrated that HD-AOS was a cumulative and multishot process with a helicity-independent demagnetization followed by a helicity-dependent magnetization recovery. Yet, the microscopic mechanism of this helicity-dependent remagnetization remained highly debated. In this thesis, we investigated the magnetization reversal mechanism of all-optical switching in ferromagnetic materials. To explore a potential switching process through domain nucleation and domain wall (DW) propagation, we studied the response of a DW upon femto- or pico-second laser irradiation in Co/Pt thin films that exhibit HD-AOS. We reported helicity-dependent all-optical domain wall motion. We demonstrated that it results from the balance of three contributions: the temperature gradient due to the laser heating, the helicity effect and the pinning effects. By measuring the magnetic circular dichroism, a purely thermal mechanism of the laser-induced DW motion appears to be excluded. Furthermore, we examined the size effects in AOS in Co/Pt films patterned into microdots with a diameter between 10 and 3 μm. This allowed us to explore the role of the dipolar field in the switching mechanism. We discovered that a larger number of laser pulses was required to reverse the magnetization of a microdot compared to the continuous film. This indicated that the dipolar field actually eases the magnetization reversal in the full film. Thus, AOS is less energy-efficient in patterned films, hence making Pt/Co/Pt multilayers not an ideal candidate for integrating AOS in spintronic devices
Wei, Jiaqi. « Magnetization manipulation induced by spin current and ultrafast laser ». Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0121.
Texte intégralMagnetization manipulation is one of the most actively researched topics in the field of spintronics. Different ways of manipulation can trigger magnetization dynamics on different time scales. Among these dynamics, magnetization precession and ultrafast demagnetization have attracted substantial interests. The frequency of magnetization precession is normally in the GHz range corresponding to a period of hundreds of ps, which is the basic mechanism of spin torque nano-oscillators (STNO), a new type of microwave devices which show advantages over conventional voltage-controlled oscillator (VCO) in terms of size, energy consumption and tunable frequency. Ultrafast demagnetization was first observed in Ni which takes places in hundreds of femtoseconds. Triggered by this, All-Optical Switching (AOS) was then demonstrated which is much faster than any torque induced switching, promising for application in the high-speed magnetic memory. Although many studies on these two phenomena have been reported, several issues need to be addressed before they move toward application. STNOs are supposed to be used for amplitude shift keying (ASK) or frequency shift keying (FSK), but the optimal conditions for these two types of microwave modulation are still not well explored. As for AOS, the influence of the laser parameters such as fluence and pulse duration and the material properties such as the composition and the thickness has not been systematically investigated. In this thesis, these two types of magnetization manipulation are studied in detail. Concerning magnetization precession, we demonstrate that a stronger magnetic field allows a wider frequency tuning range while a smaller magnetic field results in a wider amplitude tuning range. Thus, these two scenarios are applicable to FSK and ASK, respectively, providing guidelines for STNO in microwave modulation. In the second study, we demonstrate that AOS depends strongly on pulse characteristic. This was shown by building a magnetization state diagram for GdFeCo and Co/Pt which are two typical materials showing All-Optical Helicity-Independent Switching (AO-HIS) and All-Optical Helicity-Dependent Switching (AO-HDS), respectively. These results allow a better understanding of the fundamental mechanism behind laser-induced magnetization dynamics
Chapitres de livres sur le sujet "All-optical helicity-dependent switching"
Tsukamoto, A., S. Kogure, H. Yoshikawa, T. Sato et A. Itoh. « Contribution of magnetic circular dichroism in all-optical light helicity-dependent magnetic switching ». Dans Springer Proceedings in Physics, 334–36. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07743-7_103.
Texte intégralHassdenteufel, A., B. Hebler, C. Schubert, A. Liebig, M. Teich, J. Schmidt, M. Helm, M. Aeschlimann, M. Albrecht et R. Bratschitsch. « Thermally Assisted All-Optical Helicity Dependent Switching of Ferrimagnetic Amorphous Fe100−x Tb x Thin Films ». Dans Springer Proceedings in Physics, 238–40. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07743-7_74.
Texte intégralActes de conférences sur le sujet "All-optical helicity-dependent switching"
Cinchetti, M., S. Alebrand, M. Gottwald, C. H. Lambert, D. Steil, L. Pang, M. Hehn et al. « Engineering materials for all-optical helicity-dependent magnetic switching ». Dans 2014 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2014. http://dx.doi.org/10.7567/ssdm.2014.m-1-1.
Texte intégralKhalid, Muhammad Waleed, Jeongho Ha, Saeed Hemayat, Mohammed Salah El Hadri, Eric E. Fullerton et Abdoulaye Ndao. « Integration of Ultrafast Magnetism and Metasurfaces for All-Optical Helicity-Dependent Switching ». Dans Flat Optics : Components to Systems. Washington, D.C. : Optica Publishing Group, 2023. http://dx.doi.org/10.1364/flatoptics.2023.fth1b.2.
Texte intégralKhalid, Muhammad Waleed, Jeongho Ha, Saeed Hemayat, Mohammed Salah el Hadri, Eric E. Fullerton et Abdoulaye Ndao. « All-Optical Magnetization Reversal in Arbitrary Geometries using Metasurfaces ». Dans CLEO : Science and Innovations. Washington, D.C. : Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_si.2023.sth5c.4.
Texte intégralHassdenteufel, Alexander, Christian Schubert, Birgit Hebler, Helmut Schultheiss, Jürgen Fassbender, Manfred Albrecht et Rudolf Bratschitsch. « All-optical helicity dependent switching in amorphous Tb30Fe70 with a MHz laser oscillator ». Dans CLEO : Applications and Technology. Washington, D.C. : OSA, 2014. http://dx.doi.org/10.1364/cleo_at.2014.jth4j.4.
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