Time-resolved nonlinear infrared spectroscopy of samarium ions in SmFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Bossini, Davide; Malik, Deepak; Redlich, Britta; Meer, A. F. G. van der; Pisarev, R. V.; Rasing, T.H.M.; Kimel, A.V.

doi:10.1103/physrevb.87.085101

Cited by 25 publications

(17 citation statements)

References 22 publications

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“…In the terahertz spectral range, this concept can be applied to any material in which selected low-energy electronic transitions change the magnetic anisotropy, for example in oxides containing both 3d and 4f ions (for example, orthoferrites, manganites, garnets and ferroborates) and in 3d-compounds such as hematite α-Fe 2 O 3 . However, despite the anticipated strong impact of the preparation of non-thermal orbital states on the anisotropy field, terahertz spin control exploiting orbital transitions has remained largely unexplored 25,26 . Figure 1 illustrates the fundamental idea of our experiment for the case of the prototypical antiferromagnet TmFeO 3 .…”

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confidence: 99%

Nonlinear spin control by terahertz-driven anisotropy fields

et al. 2016

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Future information technologies, such as ultrafast data recording, quantum computation or spintronics, call for ever faster spin control by light [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . Intense terahertz pulses can couple to spins on the intrinsic energy scale of magnetic excitations 5,11 . Here, we explore a novel electric dipole-mediated mechanism of nonlinear terahertz-spin coupling that is much stronger than linear Zeeman coupling to the terahertz magnetic field 5,10 . Using the prototypical antiferromagnet thulium orthoferrite (TmFeO 3 ), we demonstrate that resonant terahertz pumping of electronic orbital transitions modifies the magnetic anisotropy for ordered Fe 3+ spins and triggers large-amplitude coherent spin oscillations. This mechanism is inherently nonlinear, it can be tailored by spectral shaping of the terahertz waveforms and its efficiency outperforms the Zeeman torque by an order of magnitude. Because orbital states govern the magnetic anisotropy in all transition-metal oxides, the demonstrated control scheme is expected to be applicable to many magnetic materials.Ultrafast magnetization control has become a key goal of modern photonics, with a broad variety of successful concepts emerging at a fast pace. Examples include light-induced spin reorientation in canted antiferromagnets 3 , vectorial control of magnetization by light 6 , photoinduced antiferromagnet-ferromagnet phase transitions 9 , optical modification of the exchange energy 4,14 and driving spin precessions via nonlinear magneto-phononic coupling 7,16 . Despite this remarkable progress, most of the photon energy in all known concepts using visible and near-infrared light is inactive with respect to the light-spin interaction, and avoiding dissipation of large excess energies requires special care.In contrast, intense electromagnetic pulses at terahertz frequencies may interface spin dynamics directly on their intrinsic energy scales 5,11 . The magnetic field component of few-cycle terahertz pulses has been used to coherently control magnons in the electronic ground state by direct Zeeman interaction 5,11 . Because magnetic dipole coupling is typically weak, however, terahertz-driven spin excitation has been confined to the linear response regime. Massive nonlinearities, such as terahertz-induced phase transitions 17,18 and terahertz lightwave electronics [19][20][21][22]

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confidence: 99%

Nonlinear spin control by terahertz-driven anisotropy fields

et al. 2016

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“…In the past decades, ultrafast optomagnetic recording 4 5 6 7 , laser-induced thermal spin reorientation 8 9 , temperature and/or magnetic field induced spin switching and magnetization reversal 10 11 , spin modes resonant excitation and coherent control of magnetization dynamics by the magnetic field of terahertz pulses 12 13 14 15 16 17 18 have been extensively studied in R FeO 3 . However, the study of the rare-earth electronic transition in the formation of the dynamic properties, which dominate the paramagnetic properties and the giant Faraday effect of these series of materials, should be further disclosed 19 20 21 22 .…”

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confidence: 99%

“…Such a spin reorientation is thought to arise from temperature-induced repopulation of 4f-electrons in the rare-earth ions, which leads to a renormalization of the R -Fe interaction 1 . As a result, the temperature-induced SRT is expected to affect the optical properties of the R -ions in the crystal-field 20 . The thulium (Tm) is an even-electron ion with a series of isolated singlet states, the ground multiplets of Tm ions, 6 H 3 , generated in the exchange field and crystal-field of TmFeO 3, has a strong absorption in terahertz frequency 21 22 , which allows the TmFeO 3 single crystal as a good candidate for the investigation of SRT, crystal field transition (CFT) and Tm-Fe interaction.…”

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confidence: 99%

Resolving the spin reorientation and crystal-field transitions in TmFeO3 with terahertz transient

Zhang

Liu

et al. 2016

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Rare earth orthoferrites (RFeO3) exhibit abundant physical properties such as, weak macroscopic magnetization, spin reorientation transition, and magneto-optical effect, especially the terahertz magnetic response, have received lots of attention in recent years. In this work, quasi-ferromagnetic (FM) and quasi-antiferromagnetic (AFM) modes arising from Fe sublattice of TmFeO3 single crystal are characterized in a temperature range from 40 to 300 K, by using terahertz time-domain spectroscopy (THz-TDS). The magnetic anisotropy constants in ac-plane are estimated according to the temperature-dependent resonant frequencies of both FM and AFM modes. Here, we further observe the broad-band absorptions centered ~0.52, ~0.61, and ~1.15 THz below 110 K, which are reasonably assigned to a series of crystal-field transitions (R modes) of ground multiplets (6H3) of Tm3+ ions. Specially, our finding reveals that the spin reorientation transition at a temperature interval from 93 to 85 K is driven by magnetic anisotropy, however, which plays negligible role on the electronic transitions of Tm ions in the absence of applied magnetic fields.

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“…The extremely high pulse energy contained in THz-FEL is known to enable even destructive phenomena such as desorption of molecules 23,24 and amorphous-crystalline phase transition 5,25,26 , to count a few. In this context, one can expect that the irradiation of such ultrastrong THz-FEL pulses on spin systems could potentially lead to macroscopic change of the magnetization by strongly perturbing critical order parameters such as anisotropy, exchange interactions, and domain wall mobility [27][28][29] . However, little attempts have been made in such a direction so far.…”

Section: Reconfiguration Of Magnetic Domain Structures Of Erfeo 3 By mentioning

confidence: 99%

Reconfiguration of magnetic domain structures of ErFeO3 by intense terahertz free electron laser pulses

Kurihara

Hirota

Qiu

et al. 2020

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In this paper, we irradiated the millijoule−level THz−FEL pulses on ferromagnetic domains of ErFeO 3 single crystal. We found that magnetic domain shapes can be permanently reconfigured upon irradiation by THz-FEL, without causing permanent damage in the sample. The process could be explained by the combination of ultrafast heating−induced depinning effect and entropic force due to local thermal gradient. Our result demonstrates the potential of THz−FEL as a novel light source for the investigation of thermally induced spin dynamics in the THz region, and paves way for the THz spintronic devices in future.

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Time-resolved nonlinear infrared spectroscopy of samarium ions in SmFeO3

Cited by 25 publications

References 22 publications

Nonlinear spin control by terahertz-driven anisotropy fields

Nonlinear spin control by terahertz-driven anisotropy fields

Resolving the spin reorientation and crystal-field transitions in TmFeO3 with terahertz transient

Reconfiguration of magnetic domain structures of ErFeO3 by intense terahertz free electron laser pulses

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