Spin-transport Mediated Single-shot All-optical Magnetization Switching of Metallic Films

Iihama, Satoshi; Remy, Quentin; Igarashi, Junta; Malinowski, Grégory; Hehn, Michel; Mangin, Stéphane

doi:10.7566/jpsj.90.081009

Cited by 13 publications

(7 citation statements)

References 111 publications

(173 reference statements)

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“…Note that we could not show the proof of VO 2 phase transition induced by the femtosecond pump laser pulse even if ultrafast phase transition in VO 2 induced by femtosecond laser or hot electron has been realized in the past decades. [34][35][36][37][38][39][40] However the phase transition is supposed to take place in a timescale of ≈2 ps. This process is then slower than the ultra-fast demagnetization and the travelling of the spin current in the spin-valve.…”

Section: Discussionmentioning

confidence: 99%

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition

Fan

Hehn

Wei

et al. 2022

Adv Elect Materials

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Ultrafast magnetization reversal of magnetic thin films induced by one single femtosecond laser light pulse, without any applied magnetic nor electrical field, known as all‐optical switching has become one of the most attractive technologies for prospective ultrafast and low‐energy magnetic devices. A single femtosecond laser pulse switching of a ferromagnet in specific spin valves, driven by electron pulse originating from ultrafast demagnetization of a ferrimagnetic layer, has been recently demonstrated. This opens the way to ultrafast and energy‐efficient writing for magnetic memory. Here, a new functionality is presented through introducing a thin VO2 into the specific spin valve, where a switchable ultra‐short polarized electron pulse by thermally triggering the phase transition of VO2 to dynamically control the switching of the ferromagnet is experimentally achieved. It is demonstrated that the generated ultra‐short electron pulse can be free to pass through the VO2 in its metallic state while it is blocked in its insulating state. Additionally, the change on electrical and optical properties of VO2 during the phase transition leads to various possible magnetic states. On/off ultra‐short spin current controlled by phase transition paves the way to address specific ultra‐fast spintronic devices in large array devices.

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Section: Discussionmentioning

confidence: 99%

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition

Fan

Hehn

Wei

et al. 2022

Adv Elect Materials

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“…In general, our results fuel a renewed interest in the role and tunability of magnetic anisotropies in rare-earth transitionmetal alloys and heterostructures, [51][52][53] as a result of the general ongoing fundamental and technological interest in the physics of ferrimagnets for spintronics applications. [54][55][56][57] The additional degree of freedom obtained using ultrafast modification of the magnetic anisotropy has not been extensively considered, and could lower the heat-threshold for reversing the magnetization without the loss of anisotropy and therefore stability of magnetic recording devices.…”

Section: Discussionmentioning

confidence: 99%

Laser‐Induced Transient Anisotropy and Large Amplitude Magnetization Dynamics in a Gd/FeCo Multilayer

Blank

Hermanussen

Lichtenberg

et al. 2022

Adv Materials Inter

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Ultrafast laser‐induced dynamics in a ferrimagnetic gadolinium iron cobalt (Gd/FeCo) multilayer with a magnetization compensation temperature of TM = 320 K is studied at room temperature as a function of laser‐fluence and strength of the applied magnetic field. The dynamics is found to be substantially different from that in archetypical GdFeCo alloys, and depending on the laser fluence one can distinguish two different regimes. At low laser fluence (⩽1.6 mJ cm‐2), ultrafast laser excitation of the medium triggers spin precession of an extraordinary large amplitude reaching over 30°. At high laser fluence (⩾2.2 mJ cm‐2), the pump heats the medium over the magnetization compensation point, spin precession reduces significantly in amplitude and the process of field‐assisted reversal of magnetization of Gd and FeCo is launched. It is argued that such a distinctly different laser‐induced magnetization dynamics in the multilayers compared to the alloys is due to the symmetry breaking at the numerous interfaces, giving rise to additional surface anisotropy. The temperature dependence of the latter is found to be the key ingredient in the mechanism of ultrafast laser‐induced magnetization dynamics in ferrimagnetic multilayers. Controlling the amount and properties of interfaces in multilayers can thus serve as a mean to achieve efficient ultrafast all‐optical control of magnetism.

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“…In addition, nonlocal spin transport plays an important role for ultrafast spin dynamics (22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32). In spin valve structures, transport of spin currents affects the speed and magnitude of the demagnetization process (28,32).…”

Section: Introductionmentioning

confidence: 99%

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

2023

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Laser-induced spin transport is a key ingredient in ultrafast spin dynamics. However, it remains debated to what extent ultrafast magnetization dynamics generates spin currents and vice versa. We use time- and spin-resolved photoemission spectroscopy to study an antiferromagnetically coupled Gd/Fe bilayer, a prototype system for all-optical switching. Spin transport leads to an ultrafast drop of the spin polarization at the Gd surface, demonstrating angular-momentum transfer over several nanometers. Thereby, Fe acts as spin filter, absorbing spin majority but reflecting spin minority electrons. Spin transport from Gd to Fe was corroborated by an ultrafast increase of the Fe spin polarization in a reversed Fe/Gd bilayer. In contrast, for a pure Gd film, spin transport into the tungsten substrate can be neglected, as spin polarization stays constant. Our results suggest that ultrafast spin transport drives the magnetization dynamics in Gd/Fe and reveal microscopic insights into ultrafast spin dynamics.

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Spin-transport Mediated Single-shot All-optical Magnetization Switching of Metallic Films

Cited by 13 publications

References 111 publications

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition

Laser‐Induced Transient Anisotropy and Large Amplitude Magnetization Dynamics in a Gd/FeCo Multilayer

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

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Spin-transport Mediated Single-shot All-optical Magnetization Switching of Metallic Films

Cited by 13 publications

References 111 publications

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO2 Phase Transition

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO2 Phase Transition

Laser‐Induced Transient Anisotropy and Large Amplitude Magnetization Dynamics in a Gd/FeCo Multilayer

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

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Product

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About

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition

On/Off Ultra‐Short Spin Current for Single Pulse Magnetization Reversal in a Magnetic Memory Using VO₂ Phase Transition