Efficient All-Optical Helicity Dependent Switching of Spins in a Pt/Co/Pt Film by a Dual-Pulse Excitation

Yamada, Keitaro; Kimel, A. V.; Prabhakara, Kiran Horabail; Ruta, Sergiu; Li, Tian; Ando, Fuyuki; Semin, Sergey; Ono, Teruo; Kirilyuk, Andrei; Rasing, T.H.M.

doi:10.3389/fnano.2022.765848

Cited by 18 publications

(14 citation statements)

References 46 publications

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“…These pulses thus become capable of switching specific magnetic domains [35]. We emphasize that this is completely distinct from the other form of switching found in alternative ferri-and ferro-magnets, in which many circularly-polarized optical pulses, of left-or righthanded helicity, steer magnetic switching from an initially-demagnetized state [14,15,36,16,17].…”

Section: First Measurements Of Helicity-independent All-optical Magne...mentioning

confidence: 75%

Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys

Davies,

Mentink,

Kimel

et al. 2022

Preprint

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We review and discuss the process of single-shot helicity-independent all-optical switching of magnetization by which a single suitably-ultrafast excitation, under the right conditions, toggles magnetization from one stable state to another. For almost a decade, this phenomenon was only consistently observed in specific rareearth-transition-metal ferrimagnetic alloys of GdFeCo, but breakthrough experiments in recent years have revealed that the same behavior can be achieved in a wide range of multi-sublattice magnets including TbCo alloys doped with minute amounts of Gd, Gd/Co and Tb/Co synthetic ferrimagnets, and the rare-earth-free Heusler alloy Mn 2 Ru x Ga. Aiming to resolve the conditions that allow switching, a series of experiments have shown that the process in the ferrimagnetic alloys GdFeCo and Mn 2 Ru x Ga is highly sensitive to the pulse duration, starting temperature and the alloy composition. We argue here that the switching displayed by these two very different ferrimagnetic alloys can be generally understood within a single phenomenological framework describing the flow of angular momentum between the constituent sublattices and from the sublattices to the environment. The conditions that facilitate switching stem from the properties of these channels of angular momentum flow in combination with the size of the angular momentum reservoirs. We conclude with providing an outlook in this vibrant research field, with emphasis on the outstanding open questions pertaining to the underlying physics along with noting the advances in exploiting this switching process in technological applications.

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Section: First Measurements Of Helicity-independent All-optical Magne...mentioning

confidence: 75%

Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys

Davies,

Mentink,

Kimel

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Two distinct mechanisms in the realm of magnetic materials’ reaction to laser pulses were concluded by Stanciu et al The first mechanism, helicity-dependent switching, relies on the absorption of circularly polarized light depending on the magnetization direction. This method needs multiple laser pulses, which affects its speed and broader use. − The second mechanism, single pulse helicity-independent switching, has been observed mainly in ferrimagnetic materials. It hinges on the momentum transfer between magnetic sublattices and varying demagnetization time scales in the materials involved.…”

Section: Light Modulation Of Magnetismmentioning

confidence: 99%

Perspectives: Light Control of Magnetism and Device Development

Fang,

Wu,

Zhang

et al. 2024

ACS Nano

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Accurately controlling magnetic and spin states presents a significant challenge in spintronics, especially as demands for higher data storage density and increased processing speeds grow. Approaches such as light control are gradually supplanting traditional magnetic field methods. Traditionally, the modulation of magnetism was predominantly achieved through polarized light with the help of ultrafast light technologies. With the growing demand for energy efficiency and multifunctionality in spintronic devices, integrating photovoltaic materials into magnetoelectric systems has introduced more physical effects. This development suggests that sunlight will play an increasingly pivotal role in manipulating spin orientation in the future. This review introduces and concludes the influence of various light types on magnetism, exploring mechanisms such as magneto-optical (MO) effects, light-induced magnetic phase transitions, and spin photovoltaic effects. This review briefly summarizes recent advancements in the light control of magnetism, especially sunlight, and their potential applications, providing an optimistic perspective on future research directions in this area.

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“…At least two or more laser pulse irradiations are needed to reverse the magnetization uniformly for the AOS excitation in 3d transition-metal ferromagnetic thin films. [16][17][18]22) Therefore, the light energy per magnetization reversal due to the AOS phenomenon is lower in RE-TM ferrimagnetic thin films than in 3d transition-metal ferromagnetic thin films. Alternatively, AOS can be induced more efficiently in RE-TM ferrimagnetic thin films.…”

Section: Introductionmentioning

confidence: 99%

“…AOS phenomenon has been observed in rare earth-transition metal (RE-TM) ferrimagnetic thin films, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and 3d transition-metal ferromagnetic thin films. [13][14][15][16][17][18][19][20][21][22] Although the femtosecond pulse laser induces a sub-ps magnetization reversal, the mechanism, including the ultrafast demagnetization and magnetic domain nucleation processes, are assumed to differ between these two material systems. Nonequilibrium thermal processes between sublattice spins play an important role in RE-TM ferrimagnetic thin films.…”

Section: Introductionmentioning

confidence: 99%

Electrical detection and current control of all-optical magnetization switching in GdFeCo ferrimagnetic alloy thin film

Kasatani

Yoshikawa

Tsukamoto

2022

Jpn. J. Appl. Phys.

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We experimentally demonstrated electrical detection of All-Optical magnetization switching (AOS) induced by a single femtosecond laser pulse irradiation by measuring alternate rapid changes in anomalous Hall voltage and magneto-optic image pulse by pulse in a Hall-cross shape ferrimagnetic GdFeCo alloy thin film. We also demonstrated that the amplitude of the change in anomalous Hall voltage depended on the position of the AOS-created magnetic domain on the Hall cross. Furthermore, the AOS-created magnetic domains were stable against subsequent current applications in the Hall cross circuit, whereas reversed magnetic domains were not created when the laser pulse was irradiated with a high current. We found that cooperative effect among magnetism, light, and electric current was assumed to have effects on absence of the AOS. Combined the AOS phenomenon and an electrical measurement/control techniques can realize ultrafast, deterministic, and distinguishable applications.

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Efficient All-Optical Helicity Dependent Switching of Spins in a Pt/Co/Pt Film by a Dual-Pulse Excitation

Cited by 18 publications

References 46 publications

Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys

Helicity-independent all-optical switching of magnetization in ferrimagnetic alloys

Perspectives: Light Control of Magnetism and Device Development

Electrical detection and current control of all-optical magnetization switching in GdFeCo ferrimagnetic alloy thin film

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