Ultrafast racetrack based on compensated Co/Gd-based synthetic ferrimagnet with all-optical switching

Li, Pingzhi; J., Kools, Thomas; Lavrijsen, Reinoud; Koopmans, B.

doi:10.48550/arxiv.2204.11595

Cited by 4 publications

(7 citation statements)

References 41 publications

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“…In this study, the current density is calculated as 1.0 10 10 Á m −2 when a current of 10 mA is applied. Because the current density is approximately 10-50% that of previous studies, [23][24][25][26][27] the domain wall could be displaced due to STT. However, the results in experiment (A) show that the magnetic reversal domain induced by the AOS phenomenon with no electric current did not move or change its shape SB1014-4…”

Section: Discussionmentioning

confidence: 78%

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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Section: Discussionmentioning

confidence: 78%

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 attribute this to heating effects in the CoGd films that results in an increase of the net angular momentum and thus a decrease of the DW velocity (Supporting Information). Additionally, the Joule heating is also responsible for the lower DW velocities compared to recent studies that reported DW velocities higher than 1000 m s –1 in CoGd-based ferrimagnets , as the heating pushes our CoGd films away from angular momentum compensation. These results demonstrate that the CoGd films we optimized , have low DW pinning and density of natural defects leading to fast DW motion induced by SOTs making these structures ideal to study skyrmion motion.…”

mentioning

confidence: 68%

Zero-Field Nucleation and Fast Motion of Skyrmions Induced by Nanosecond Current Pulses in a Ferrimagnetic Thin Film

Quessab

Cogulu

et al. 2022

Nano Lett.

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Skyrmion racetrack memories are highly attractive for next-generation data storage technologies. Skyrmions are noncollinear spin textures stabilized by chiral interactions. To achieve a fast-operating memory device, it is critical to move skyrmions at high speeds. The skyrmion dynamics induced by spin–orbit torques (SOTs) in the commonly studied ferromagnetic films is hindered by strong pinning effects and a large skyrmion Hall effect causing deflection of the skyrmion toward the racetrack edge, which can lead to information loss. Here, we investigate the current-induced nucleation and motion of skyrmions in ferrimagnetic Pt/CoGd/(W or Ta) thin films. We first reveal field-free skyrmion nucleation mediated by Joule heating. We then achieve fast skyrmion motion driven by SOTs with velocities as high as 610 m s–1 and a small skyrmion Hall angle |θSkHE| ≲ 3°. Our results show that ferrimagnets are better candidates for fast skyrmion-based memory devices with low risk of information loss.

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“…The reading module is composed of a doublet of V-shaped gold plasmonic nanoantennas coupled with a magnetic racetrack as a top-cladding on the InP waveguide. A magnetic racetrack enables densely storing of information as up and down magnetization states [18], which can be moved along the racetrack by electrical current [19], [20], [21]. The racetrack is modelled as a multilayer stack (from bottom to top) of 4 nm heavy metal tantalum seed layer, 2 nm platinum layer, 2 nm ferromagnetic cobalt layer with a MO Voigt constant of Q = 0.154-0.100i [22] (responsible for PMOKE in our simulation model), and a 2 nm platinum capping layer.…”

Section: Design Structure and Function Principlementioning

confidence: 99%

Optical Reading of Nanoscale Magnetic Bits in an Integrated Photonic Platform

Pezeshki

Lavrijsen

et al. 2023

IEEE J. Quantum Electron.

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Ultrafast racetrack based on compensated Co/Gd-based synthetic ferrimagnet with all-optical switching

Cited by 4 publications

References 41 publications

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

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

Zero-Field Nucleation and Fast Motion of Skyrmions Induced by Nanosecond Current Pulses in a Ferrimagnetic Thin Film

Optical Reading of Nanoscale Magnetic Bits in an Integrated Photonic Platform

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