Photocreating supercooled spiral-spin states in a multiferroic manganite

Sheu, Yae‐Lin; Ogawa, Norio; Tokura, Y.

doi:10.1103/physrevb.94.081107

Cited by 3 publications

(3 citation statements)

References 53 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…In fact, distinguishing between order-parameter and electron dynamics is commonly believed to be a "practical impossibility" [15]. This is particularly true for thermal excitations, where redistribution of resonantly excited charge carriers leads to substantial changes in the linear optical properties [16][17][18][19].…”

mentioning

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].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Tracking the ultrafast motion of an antiferromagnetic order parameter

2019

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Tracking the ultrafast motion of an antiferromagnetic order parameter

2019

View full text Add to dashboard Cite

show abstract

Directly probing spin dynamics in insulating antiferromagnets using ultrashort terahertz pulses

et al. 2016

View full text Add to dashboard Cite

We investigate spin dynamics in the antiferromagnetic (AFM) multiferroic TbMnO3 using opticalpump, terahertz (THz)-probe spectroscopy. Photoexcitation results in a broadband THz transmission change, with an onset time of 25 ps at 6 K that becomes faster at higher temperatures. We attribute this time constant to spin-lattice thermalization. The excellent agreement between our measurements and previous ultrafast resonant x-ray diffraction measurements on the same material confirms that our THz pulse directly probes spin order. We suggest that this could be the case in general for insulating AFM materials, if the origin of the static absorption in the THz spectral range is magnetic.

show abstract