Spin dynamics of antiferromagnets under action of femtosecond laser pulses (Review Article)

Иванов, Б. А.

doi:10.1063/1.4865565

Cited by 84 publications

(67 citation statements)

References 51 publications

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“…Although the THz emission spectroscopy measurements clearly reveal that the mode is excited in both TmFeO 3 and ErFeO 3 , it has never been observed before in either optical pump-probe measurements [10][11][12] or in timedomain THz absorption spectroscopy [25]. The appearance of this formerly unobserved spectral peak would suggest that the laser-induced spin dynamics of the orthoferrites may be more complicated than previously thought [43]. Moreover, it also raises a question about the origin of this mode.…”

Section: Discussionmentioning

confidence: 77%

Terahertz emission spectroscopy of laser-induced spin dynamics inTmFeO3andErFeO3orthoferrites

et al. 2014

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Using the examples of laser-induced spin-reorientation phase transitions in TmFeO 3 and ErFeO 3 orthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced spin dynamics, which is not accessible by more common all-optical methods. The power of the method is evidenced by the fact that, in addition to the expected quasi-ferromagnetic and quasi-antiferromagnetic modes of the iron sublattices, terahertz emission spectroscopy enables detection of a resonance optically excited at an unexpected frequency of ß0.3-0.35 THz. By recording how the amplitude and phase of the excited oscillations depend on temperature and applied magnetic field, we show that the unexpected mode has all the features of a spin resonance of the Fe 3+ ions. We suggest that it can be assigned to transitions between the multiplet sublevels of the 6 A 1 ground state of the Fe +3 ions occupying rare-earth positions.

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Section: Discussionmentioning

confidence: 77%

Terahertz emission spectroscopy of laser-induced spin dynamics inTmFeO3andErFeO3orthoferrites

et al. 2014

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“…Then, introducing the AFM Neel vector1830 l = ( M 1 − M 2 )/2 M s the spin-pumping current (1) can be written as:…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, a number of effects studied previously in JJ oscillators at cryogenic temperatures can also be observed in the room-temperature AFM oscillators. In particular, the inertial nature of the AFM dynamics18 leads to the hysteretic behavior of the AFM oscillator, which, therefore, have two different current thresholds: an “ignition” threshold, which is required to start the generation, and a lower “elimination” threshold which, in our case, is twice less then the “ignition” threshold, defining the minimum current density needed to support the generation, once it has been started.…”

mentioning

confidence: 97%

Antiferromagnetic THz-frequency Josephson-like Oscillator Driven by Spin Current

Khymyn

Lisenkov

Tiberkevich

et al. 2017

Sci Rep

253

237

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The development of compact and tunable room temperature sources of coherent THz-frequency signals would open a way for numerous new applications. The existing approaches to THz-frequency generation based on superconductor Josephson junctions (JJ), free electron lasers, and quantum cascades require cryogenic temperatures or/and complex setups, preventing the miniaturization and wide use of these devices. We demonstrate theoretically that a bi-layer of a heavy metal (Pt) and a bi-axial antiferromagnetic (AFM) dielectric (NiO) can be a source of a coherent THz signal. A spin-current flowing from a DC-current-driven Pt layer and polarized along the hard AFM anisotropy axis excites a non-uniform in time precession of magnetizations sublattices in the AFM, due to the presence of a weak easy-plane AFM anisotropy. The frequency of the AFM oscillations varies in the range of 0.1–2.0 THz with the driving current in the Pt layer from 108 A/cm2 to 109 A/cm2. The THz-frequency signal from the AFM with the amplitude exceeding 1 V/cm is picked up by the inverse spin-Hall effect in Pt. The operation of a room-temperature AFM THz-frequency oscillator is similar to that of a cryogenic JJ oscillator, with the energy of the easy-plane magnetic anisotropy playing the role of the Josephson energy.

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“…Spin dynamics and magnon dispersions in AFM and FM differ significantly: the strong exchange coupling between different magnetic sublattices of an AFM leads to an 'exchange enhancement' which pushes magnetic resonance frequencies into the THz regime and increases spin wave velocities [135], (section 12). In addition, the inherent inertial nature of the dynamics in AFM leads to hysteretic effects of the dynamics.…”

Section: Antiferromagnetic (Afm) Magnon Spintronicsmentioning

confidence: 99%

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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Spin dynamics of antiferromagnets under action of femtosecond laser pulses (Review Article)

Cited by 84 publications

References 51 publications

Terahertz emission spectroscopy of laser-induced spin dynamics inTmFeO3andErFeO3orthoferrites

Terahertz emission spectroscopy of laser-induced spin dynamics inTmFeO3andErFeO3orthoferrites

Antiferromagnetic THz-frequency Josephson-like Oscillator Driven by Spin Current

The 2017 Magnetism Roadmap

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