Model for multishot all-thermal all-optical switching in ferromagnets

Gorchon, Jon; Yang, Yang; Bokor, Jeffrey

doi:10.1103/physrevb.94.020409

Cited by 74 publications

(76 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this section, we will discuss the microscopic origin of the effect of the helicity and its contribution to the laser-induced DW motion. Several mechanisms explaining AO-HDS in ferromagnetic thin films can be found in the literature based on either inverse Faraday effect (IFE) [11] or magnetic circular dichroism (MCD) [10,12]. Here, we discuss two hypotheses to explain light-induced DW motion based either on athermal or pure thermal effects.…”

Section: B Models For the Effect Of The Helicity On The Domain Wallmentioning

confidence: 96%

Helicity-dependent all-optical domain wall motion in ferromagnetic thin films

et al. 2018

View full text Add to dashboard Cite

Domain wall displacement in Co/Pt thin films induced by not only fs-but also ps-laser pulses is demonstrated using time-resolved magneto-optical Faraday imaging. We evidence multi-pulse helicity-dependent laser-induced domain wall motion in all-optical switchable Co/Pt multilayers with a laser energy below the switching threshold. Domain wall displacement of ∼ 2 nm per 2ps pulse is achieved. By investigating separately the effect of linear and circular polarization, we reveal that laser-induced domain wall motion results from a complex interplay between pinning, temperature gradient and helicity effect. Then, we explore the microscopic origin of the helicity effect acting on the domain wall. These experimental results enhance the understanding of the mechanism of all-optical switching in ultra-thin ferromagnetic films.

show abstract

Section: B Models For the Effect Of The Helicity On The Domain Wallmentioning

confidence: 96%

Helicity-dependent all-optical domain wall motion in ferromagnetic thin films

et al. 2018

View full text Add to dashboard Cite

show abstract

“…These paradoxically contradictory results challenge our understanding and are difficult to reconcile. Over the years, the explanation progresses from the inverse Faraday effect [10,19], Raman scattering [20,21], magnetic circular dichroism [22], pure heating [16], and sublattice spin exchange [23], to ultrafast exchange scattering [24], with new theories emerging in ferromagnets [25][26][27]. This raises a serious question whether a big picture is missing from the existing theories [28].…”

Section: Introductionmentioning

confidence: 99%

First-principles and model simulation of all-optical spin reversal

et al. 2017

View full text Add to dashboard Cite

All-optical spin switching is a potential trailblazer for information storage and communication at an unprecedented fast rate and free of magnetic fields. However, the current wisdom is largely based on semiempirical models of effective magnetic fields and heat pulses, so it is difficult to provide high-speed design protocols for actual devices. Here, we carry out a massively parallel first-principles and model calculation for thirteen spin systems and magnetic layers, free of any effective field, to establish a simpler and alternative paradigm of laser-induced ultrafast spin reversal and to point out a path to a full-integrated photospintronic device. It is the interplay of the optical selection rule and sublattice spin orderings that underlines seemingly irreconcilable helicity-dependent/independent switchings. Using realistic experimental parameters, we predict that strong ferrimagnets, in particular, Laves phase C15 rare-earth alloys, meet the telecommunication energy requirement of 10 fJ, thus allowing a cost-effective subpicosecond laser to switch spin in the GHz region.Comment: 23 pages, 6 figures and one tabl

show abstract

“…Therefore, we have consistently demonstrated single-shot AOS in various ferromagnetic films. We emphasize that the pulses used in all experiments are linearly polarized, thereby excluding any type of helicity dependent magneto-optical mechanisms 9,18,19 .…”

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

View full text Add to dashboard Cite

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.

show abstract

Model for multishot all-thermal all-optical switching in ferromagnets

Cited by 74 publications

References 25 publications

Helicity-dependent all-optical domain wall motion in ferromagnetic thin films

Helicity-dependent all-optical domain wall motion in ferromagnetic thin films

First-principles and model simulation of all-optical spin reversal

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

Contact Info

Product

Resources

About