Selective probe of coherent polar phonon and quasiferromagnetic resonance modes in multiferroic 
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Sheu, Yae‐Lin; Ogawa, Norio; Tokunaga, Yusuke; Chan, Hsun-Wei; Tokura, Y.

doi:10.1103/physrevb.98.100301

Cited by 12 publications

(8 citation statements)

References 34 publications

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“…There are two fundamentally different mechanisms that can affect through : (i) symmetry-conserving dynamics involving amplitude modulations of the existing components . Examples are longitudinal coherent dynamics 35,36 , changes of the exchange interaction 37,38 as well as thermally induced quenching dynamics 17,20 . Or (ii) symmetry-changing dynamics leading to the appearance of new components .…”

Section: Resultsmentioning

confidence: 99%

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Tracking the ultrafast motion of an antiferromagnetic order parameter

2019

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The unique functionalities of antiferromagnets offer promising routes to advance information technology. Their compensated magnetic order leads to spin resonances in the THz-regime, which suggest the possibility to coherently control antiferromagnetic (AFM) devices orders of magnitude faster than traditional electronics. However, the required time resolution, complex sublattice interactions and the relative inaccessibility of the AFM order parameter pose serious challenges to studying AFM spin dynamics. Here, we reveal the temporal evolution of an AFM order parameter directly in the time domain. We modulate the AFM order in hexagonal YMnO 3 by coherent magnon excitation and track the ensuing motion of the AFM order parameter using time-resolved optical second-harmonic generation. The dynamic symmetry reduction by the moving order parameter allows us to separate electron dynamics from spin dynamics. As transient symmetry reductions are common to coherent excitations, we have a general tool for tracking the ultrafast motion of an AFM order parameter.

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Section: Resultsmentioning

confidence: 99%

“…Examples are longitudinal coherent dynamics [27,28], changes of the exchange interaction [26,29] as well as thermally induced quenching dynamics [16,19].…”

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confidence: 99%

Tracking the ultrafast motion of an antiferromagnetic order parameter

2019

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“…The GdFeO 3 (GFO) is a typical canted antiferromagnet without the spin reorientation phase transition, whose AFM spin dynamics triggered by optical method remains elusive. It has only been detected via second harmonic generation at extremely low temperature 1.5 K, [14] whereas the roomtemperature spin dynamics via optical excitation is to be explored. Recently, in the case of the interfacial exchange coupling with an Fe layer, the AFM spin dynamics in ErFeO 3 can be probed via an all-optical method away from the spin reorientation temperature range.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure*

Li¹,

Tang²,

Su³

et al. 2021

Chinese Phys. B

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We investigate the ultrafast spin dynamics of an antiferromagnet in a ferromagnet/antiferromagnet heterostructure Fe/GdFeO3 via an all-optical method. After laser irradiation, the terahertz spin precession is hard to be excited in a bare GdFeO3 without spin reorientation phase but efficiently in Fe/GdFeO3. Both quasi-ferromagnetic and impurity modes, as well as a phonon mode, are observed. We attribute it to the optical modification of interfacial exchange coupling between Fe and GdFeO3. Moreover, the excitation efficiency of dynamics can be modified significantly via the pump laser influence. Our results elucidate that the interfacial exchange coupling is a feasible stimulation to efficiently excite terahertz spin dynamics in antiferromagnets. It will expand the exploration of terahertz spin dynamics for antiferromagnet-based opto-spintronic devices.

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“…Besides the strong signal of SHG arising from broken inversion symmetry, the breaking of timeinversion symmetry in magnetic ordered structure may also contribute to SHG. Therefore SHG is often used to investigate noncentrosymmetric AFM and multiferroics [8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Revealing magnetoelectric coupling effect in polar antiferromagnet Fe$_2$Mo$_3$O$_8$ by static and time resolved second harmonic generation

Shi¹,

Wu²,

Lin³

et al. 2021

Preprint

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We present both static and time-resolved second harmonic generation (SHG) measurements on polar antiferromagnet Fe 2 Mo 3 O 8 to monitor the evolution of the electric polarization change and its coupling to magnetic order. We find that only one of the second order tensor elements, χ (2) ccc ,shows a prominent change below the Neel temperature T N = 60 K, indicating a magnetic order induced electric polarization change along the c-axis. Time-resolved SHG measurement reveals an ultrafast recovery of the second order tensor element upon the ultrashort laser excitation with fluence above 0.3 mJ/cm 2 , yielding evidence for a photoinduced ultrafast phase transition from the AFM ordered state to the paramagnetic state. Our work will help understand the spin induced polarization and the ultrafast optical tuning effect in Fe 2 Mo 3 O 8 .

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Selective probe of coherent polar phonon and quasiferromagnetic resonance modes in multiferroic GdFeO3

Cited by 12 publications

References 34 publications

Tracking the ultrafast motion of an antiferromagnetic order parameter

Tracking the ultrafast motion of an antiferromagnetic order parameter

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure*

Revealing magnetoelectric coupling effect in polar antiferromagnet Fe$_2$Mo$_3$O$_8$ by static and time resolved second harmonic generation

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Selective probe of coherent polar phonon and quasiferromagnetic resonance modes in multiferroic GdFeO3

Cited by 12 publications

References 34 publications

Tracking the ultrafast motion of an antiferromagnetic order parameter

Tracking the ultrafast motion of an antiferromagnetic order parameter

Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO3 heterostructure*

Revealing magnetoelectric coupling effect in polar antiferromagnet Fe$_2$Mo$_3$O$_8$ by static and time resolved second harmonic generation

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Product

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Antiferromagnetic spin dynamics in exchanged-coupled Fe/GdFeO₃ heterostructure*