Hot-Electron-Induced Ultrafast Demagnetization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Co</mml:mi><mml:mo>/</mml:mo><mml:mi>Pt</mml:mi></mml:mrow></mml:math>Multilayers

Bergeard, Nicolas; Hehn, Michel; Mangin, Stéphane; Lengaigne, G.; Montaigne, F.; Lalieu, Mark L. M.; Koopmans, B.; Malinowski, Grégory

doi:10.1103/physrevlett.117.147203

Cited by 117 publications

(138 citation statements)

References 39 publications

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“…These hot electrons are shown to travel into the Cu layer before interacting with the magnetization of the [Co/Pt] multilayer. It is then demonstrated that hot electrons alone can very efficiently induce ultrafast demagnetization [123]. More importantly, simulations based on hot electron ballistic transport, implemented within a microscopic model that accounts for the local dissipation of angular momentum, nicely reproduce the experimental results, ruling out the contribution of pure thermal transport [123].…”

Section: Institut Jean Lamour Umr 7198 Cnrs -Université De Lorrainementioning

confidence: 59%

“…It is then demonstrated that hot electrons alone can very efficiently induce ultrafast demagnetization [123]. More importantly, simulations based on hot electron ballistic transport, implemented within a microscopic model that accounts for the local dissipation of angular momentum, nicely reproduce the experimental results, ruling out the contribution of pure thermal transport [123]. Moreover, by replacing the [Co/Pt] layer by a GdFeCo layer, GdFeCo magnetization switching using ultrafast hot electron pulses and without direct light interaction was demonstrated [124].…”

Section: Institut Jean Lamour Umr 7198 Cnrs -Université De Lorrainementioning

confidence: 99%

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The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

323

207

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Building upon the success and relevance of the 2014 Magnetism Roadmap, this 2017 Magnetism Roadmap edition follows a similar general layout, even if its focus is naturally shifted, and a different group of experts and, thus, viewpoints are being collected and presented. More importantly, key developments have changed the research landscape in very relevant ways, so that a novel view onto some of the most crucial developments is warranted, and thus, this 2017 Magnetism Roadmap article is a timely endeavour. The change in landscape is hereby not exclusively scientific, but also reflects the magnetism related industrial application portfolio. Specifically, Hard Disk Drive technology, which still dominates digital storage and will continue to do so for many years, if not decades, has now limited its footprint in the scientific Topical ReviewOriginal content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. and research community, whereas significantly growing interest in magnetism and magnetic materials in relation to energy applications is noticeable, and other technological fields are emerging as well. Also, more and more work is occurring in which complex topologies of magnetically ordered states are being explored, hereby aiming at a technological utilization of the very theoretical concepts that were recognised by the 2016 Nobel Prize in Physics.Given this somewhat shifted scenario, it seemed appropriate to select topics for this Roadmap article that represent the three core pillars of magnetism, namely magnetic materials, magnetic phenomena and associated characterization techniques, as well as applications of magnetism. While many of the contributions in this Roadmap have clearly overlapping relevance in all three fields, their relative focus is mostly associated to one of the three pillars. In this way, the interconnecting roles of having suitable magnetic materials, understanding (and being able to characterize) the underlying physics of their behaviour and utilizing them for applications and devices is well illustrated, thus giving an accurate snapshot of the world of magnetism in 2017.The article consists of 14 sections, each written by an expert in the field and addressing a specific subject on two pages. Evidently, the depth at which each contribution can describe the subject matter is limited and a full review of their statuses, advances, challenges and perspectives cannot be fully accomplished. Also, magnetism, as a vibrant research field, is too diverse, so that a number of areas will not be adequately represented here, leaving space for further Roadmap editions in the future. However, this 2017 Magnetism Roadmap article can provide a frame that will enable the reader to judge where each subject and magnetism research field stands overall today and which directions it might take in the foreseeable future.The first mater...

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Section: Institut Jean Lamour Umr 7198 Cnrs -Université De Lorrainementioning

confidence: 59%

Section: Institut Jean Lamour Umr 7198 Cnrs -Université De Lorrainementioning

confidence: 99%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

323

207

View full text Add to dashboard Cite

show abstract

“…Recently, photo‐induced spin dynamics has been extensively investigated since Beaurepaire et al first reported an ultrafast demagnetization by femtosecond laser pulse in ferromagnetic Ni film by means of time‐resolved magneto‐optical Kerr effect (TR‐MOKE) measurement . Several mechanisms, such as electron–magnon interaction, Coulomb interaction, electron–phonon scattering, effect of magnetic domain, direct angular momentum transfer, hot‐electron‐induced demagnetization, and superdiffusive spin current, have been proposed to explain the ultrafast demagnetization phenomenon. The exact underlying physics of the ultrafast spin dynamics is still under intense debate.…”

Section: Introductionmentioning

confidence: 99%

Intriguing Hysteresis Dynamics in Ultrafast Photo‐Induced Magnetization

Shim

Kim

Piao

et al. 2019

Physica Status Solidi (b)

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Time‐resolved magneto‐optical Kerr effect measurement is carried out to determine ultrafast hysteresis behavior during a photo‐induced demagnetization/remagnetization process for Co/Pt ferromagnetic multilayers. Due to the stroboscopic measurement scheme, hysteresis curve measured by a pump–probe technique exhibits an irreversible behavior, repeatedly reset to a metastable hysteresis state at each stroboscopic measurement, observed as the reduction of the coercivity. It is demonstrated that the stroboscopically measured hysteresis and the coercivity could be a stable parameter in describing the ultrafast photo‐induced spin dynamics for both reversible and irreversible behaviors. Moreover, it is found that an unusual coercivity behavior exists together with a nontrivial magnetization change under external fields comparable to the coercivity of the sample.

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“…In addition, since Malinowski 17 et al first proposed that the laser excited spin current transport could increase and speed up the magnetic quenching in metallic heterostructures, the laser-induced super-diffusive spin current was raised to play an important role in determining the ultrafast demagnetization in metallic films or heterostructures [18][19][20][21][22] . However, the recent demonstration 23 shows that the unpolarized hot electrons transport can 4 demagnetize a ferromagnet, indicating the local spin angular momentum dissipation is unavoidable even when super-diffusive spin transport domains in the metallic heterostructures. Moreover, even in the similar samples, the local spin-flip scattering and nonlocal spin transport mechanism were proposed respectively by different experimental tools 19,24 to explain the ultrafast demagnetization.…”

mentioning

confidence: 99%

“…It is harmful for clarifying the underlying ultrafast demagnetization mechanism in such metallic heterostructures. Therefore, an effective method to distinguish the two dominant contributions to ultrafast demagnetization in metallic heterostructures is highly desirable 19,23,24 . Here, we propose that investigating both the ultrafast demagnetization time and Gilbert damping 25 simultaneously is a candidate method, although the relationship between the two parameters has never been unified successfully so far between the experiments and theoretical predictions.…”

mentioning

confidence: 99%