Macrospin dynamics in antiferromagnets triggered by sub-20 femtosecond injection of nanomagnons

Bossini, Davide; Conte, Stefano Dal; Hashimoto, Yuichiro; Secchi, Andrea; Pisarev, R. V.; Rasing, T.H.M.; Cerullo, Giulio; Kimel, A.V.

doi:10.1038/ncomms10645

Cited by 111 publications

(146 citation statements)

References 43 publications

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“…While investigated theoretically, the latter have been largely forgotten, probably owing to the experimental challenge of generating them. The squeezing concept applies to bosonic modes in general, and squeezed states of magnons [14][15][16][17] and phonons 18 have also been achieved experimentally.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations

et al. 2019

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Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a Néel ordered configuration, a spin-flip restricted to one of the sublattices is called a sublatticemagnon. We show that an antiferromagnetic spin-up magnon is comprised by a quantum superposition of states with n+1 spin-up and n spin-down sublattice-magnons, and is thus an enormous excitation despite its unit net spin. Consequently, its large sublattice-spin can amplify its coupling to other excitations. Employing von Neumann entropy as a measure, we show that the antiferromagnetic eigenmodes manifest a high degree of entanglement between the two sublattices, thereby establishing antiferromagnets as reservoirs for strong quantum correlations. Based on these insights, we outline strategies for exploiting the strong quantum character of antiferromagetic (squeezed-)magnons and give an intuitive explanation for recent experimental and theoretical findings in antiferromagnetic magnon spintronics. arXiv:1904.04553v3 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations

et al. 2019

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“…Contact-free THz electrical-radiation pulses allow us to reduce the length further to picoseconds, employing the same spin-torque switching mechanism in metallic antiferromagnets. THz and optical laser excitation of antiferromagnetic resonance, combined with a time-domain magneto-optical detection (section 7), were realized in NiO and other insulating antiferromagnets [157,158] (figure 21). The challenge is to realize ultra-fast and energy-efficient magnetic memory-logic components for both micro and opto-electronics.…”

Section: Electrical Reading Of Information In Antiferromagnetsmentioning

confidence: 99%

The 2017 Magnetism Roadmap

Sander

Valenzuela

Makarov

et al. 2017

J. Phys. D: Appl. Phys.

326

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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“…Timeresolved optical Kerr and Faraday rotation measurements more directly probe FM order [6], and can be sensitive to the appearance of a net magnetization in optically excited AFM systems [13]. Second-order magneto-optical effects, such as magnetic linear birefringence and linear dichroism, are also sensitive to AFM order [14,15] but the magnetic effects must be distinguished from other sources of birefringence or dichroism. Optical second harmonic generation (SHG) is another probe of AFM spin order [16,17]; however, when applied to multiferroics it must be separated from the larger ferroelectric SHG signal.…”

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confidence: 99%

Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroicHoMnO3

Bowlan¹,

Trugman²,

Bowlan³

et al. 2016

Phys. Rev. B

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We demonstrate a new approach for directly tracking antiferromagnetic (AFM) spin dynamics by measuring ultrafast changes in a magnon resonance. We test this idea on the multiferroic HoMnO3 by optically photoexciting electrons, after which changes in the spin order are probed with a THz pulse tuned to a magnon resonance. This reveals a photoinduced change in the magnon line shape that builds up over 5-12 picoseconds, which we show to be the spin-lattice thermalization time, indicating that electrons heat the spins via phonons. We compare our results to previous studies of spin-lattice thermalization in ferromagnetic (FM) manganites, giving insight into fundamental differences between the two systems. Our work sheds light on the microscopic mechanism governing spin-phonon interactions in AFMs and demonstrates a powerful approach for directly monitoring ultrafast spin dynamics.

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Macrospin dynamics in antiferromagnets triggered by sub-20 femtosecond injection of nanomagnons

Cited by 111 publications

References 43 publications

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations

Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations

The 2017 Magnetism Roadmap

Probing ultrafast spin dynamics through a magnon resonance in the antiferromagnetic multiferroicHoMnO3

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