Ultrafast magnetic switching of GdFeCo with electronic heat currents

Wilson, R. B.; Gorchon, Jon; Yang, Yang; Lambert, Charles‐Henri; Salahuddin, Sayeef; Bokor, Jeffrey

doi:10.1103/physrevb.95.180409

Cited by 52 publications

(42 citation statements)

References 35 publications

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“…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]. These findings confirm the work reported by Wilson et al [125]. Therefore, switching the magnetization at the picosecond timescale with a single electronic pulse represents a major step towards the future developments of ultrafast spintronic.…”

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

confidence: 78%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

320

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 Lorrainesupporting

confidence: 78%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

320

207

View full text Add to dashboard Cite

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“…In a number of recent experiments [1][2][3][4][5][6][7][8] , it has been shown that femtosecond laser pulses can control magnetization on picosecond timescales, which is at least an order of magnitude faster compared to conventional magnetization dynamics. Among these demonstrations, the material system, GdFeCo ferrimagnetic films, is particularly interesting because deterministic toggleswitching of the magnetic order is possible without any external magnetic field.…”

Section: Main Textmentioning

confidence: 99%

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

Gorchon

Lambert

Yang

et al. 2017

Applied Physics Letters

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A single femto-second optical pulse can fully reverse the magnetization of a film within picoseconds. Such fast operation hugely increases the range of application of magnetic devices. However, so far, this type of ultrafast switching has been restricted to ferri-magnetic GdFeCo films. In contrast, all optical switching of ferro-magnetic films require multiple pulses, thereby being slower and less energy efficient. Here, we demonstrate magnetization switching induced by a single laser pulse in various ferromagnetic Co/Pt multilayers grown on GdFeCo, by exploiting the exchange coupling between the two magnetic films. Table-top picoseconds. This coupling approach will allow ultrafast control of a variety of magnetic films, critical for applications.

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“…We use the following exchange parameters for the interaction between spins located on the same sublattice A/B, J AA = 16 meV, J BB = 0.5 meV, and between spins on different sublattices, J AB = −6 meV. These values are characteristic for ferrimagnetic RE-transition metal (TM) alloys [59], which are testbed materials in the field of ultrafast spin dynamics [13][14][15][16][17], and are receiving an increasing attention in the field of spintronics [54].…”

Section: A Atomistic Spin Modelmentioning

confidence: 99%

“…We assume a lattice constant of a = 250 pm. Similar models have been already used in the literature to model the spin dynamics of ferrimagnetic systems, the most prominent example being GdFeCo alloys used for ultrafast toggle switching [13][14][15][16][18][19][20] and HD-AOS [25,29,30]. Despite their potential key role on such a switching process, the study of DW motion under thermal gradients of such kind of materials [6] has gained far less attention.…”

Section: A Atomistic Spin Modelmentioning

confidence: 99%

“…domain wall (DW) motion by temperature gradients [5][6][7][8][9][10][11][12], and the field of ultrafast spin dynamics, e.g. thermallyinduced magnetic toggle-switching by ultrafast heat load in ferrimagnets (FIs) [13][14][15][16][17][18][19][20][21][22]. Other coherent means of manipulating magnetic textures, such as heat-assisted magnetic recording (HAMR) [23,24] and helicity-dependent all-optical switching (HD-AOS) for instance [25][26][27][28][29][30]-albeit not primarily induced thermally-are facilitated tremendously by additional application of an ultrashort thermal excitation und subsequent demagnetization [31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: Competition of angular momentum transfer and entropic torque

Donges

Grimm

Jakobs

et al. 2020

Phys. Rev. Research

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Control of magnetic domain wall motion holds promise for efficient manipulation and transfer of magnetically stored information. Thermal magnon currents, generated by temperature gradients, can be used to move magnetic textures, from domain walls, to magnetic vortices and skyrmions. In the last years, theoretical studies have centered in ferro-and antiferromagnetic spin structures, where domain walls always move towards the hotter end of the thermal gradient. Here we perform numerical studies using atomistic spin dynamics simulations and complementary analytical calculations to derive an equation of motion for the domain wall velocity. We demonstrate that in ferrimagnets, domain wall motion under thermal magnon currents shows a much richer dynamics. Below the Walker breakdown, we find that the temperature gradient always pulls the domain wall towards the hot end by minimizating its free energy, in agreement with the observations for ferro-and antiferromagnets in the same regime. Above Walker breakdown, the ferrimagnetic domain wall can show the opposite, counterintuitive behavior of moving towards the cold end. We show that in this case, the motion to the hotter or the colder ends is driven by angular momentum transfer and therefore strongly related to the angular momentum compensation temperature, a unique property of ferrimagnets where the intrinsic angular momentum of the ferrimagnet is zero while the sublattice angular momentum remains finite. In particular, we find that below the compensation temperature the wall moves towards the cold end, whereas above it, towards the hot end. Moreover, we find that for ferrimagnets, there is a torque compensation temperature at which the domain wall dynamics shows similar characteristics to antiferromagnets, that is, quasi-inertia-free motion and the absence of Walker breakdown. This finding opens the door for fast control of magnetic domains as given by the antiferromagnetic character while conserving the advantage of ferromagnets in terms of measuring and control by conventional means such as magnetic fields. arXiv:1911.05393v1 [cond-mat.mtrl-sci]

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Ultrafast magnetic switching of GdFeCo with electronic heat currents

Cited by 52 publications

References 35 publications

The 2017 Magnetism Roadmap

The 2017 Magnetism Roadmap

Single shot ultrafast all optical magnetization switching of ferromagnetic Co/Pt multilayers

Unveiling domain wall dynamics of ferrimagnets in thermal magnon currents: Competition of angular momentum transfer and entropic torque

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