Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mrow><mml:mtext>MnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mtext>Gd</mml:mtext></mml:mrow></mml:math>, Tb, Dy, and Ho) t

Choi, Woo Seok; Moon, Seok‐Jun; Seo, S. S. A.; Lee, Daesu; Lee, Jung Hyuk; Murugavel, P.; Noh, Tae Won; Lee, Yun Sang

doi:10.1103/physrevb.78.054440

Cited by 41 publications

(22 citation statements)

References 32 publications

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“…The spin flip is accompanied with resonant electronic excitation of d-d transition, i.e., the electronic excited d state with m s = −2 can be much more easily achieved. This is consistent with the temperature dependent study of on-site d-d transition, which showed that the transition has a blueshift of~0.1 eV with cooling in the antiferromagnetic state [106,107]. This blueshift is attributed to the differences in exchange interaction in the excited and ground states of a given Mn 3+ ion [106].…”

Section: Broad Linewidthsupporting

confidence: 90%

Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering

et al. 2019

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Magnonics, an emerging research field, aims to control and manipulate spin waves in magnetic materials and structures. However, the current understanding of spin waves remains quite limited. This review attempts to provide an overview of the anomalous behaviors of spin waves in various types of magnetic materials observed thus far by inelastic light scattering experiments. The anomalously large asymmetry of anti-Stokes to Stokes intensity ratio, broad linewidth, strong resonance effect, unique polarization selection, and abnormal impurity dependence of spin waves are discussed. In addition, the mechanisms of these anomalous behaviors of spin waves are proposed. spectroscopy is applied for studying vibrational properties of materials. However, due to the anomalous behaviors of spin wave scattering comparing with vibrational scattering, Raman spectroscopy study of spin wave is difficult and limited. In this paper, we present a review of anomalous behaviors of spin waves observed by inelastic light scattering experiments, especially by Raman spectroscopy. The large asymmetry of anti-Stokes to Stokes intensity ratio, broad linewidth, strong resonance effect, unique polarization selection, and abnormal impurity dependence of spin waves are discussed, and a proposed model for the mechanisms of spin flip, spin relaxing, and spin wave scattering is presented for understanding these anomalous behaviors of spin waves. In addition, two magnonic crystal structures are proposed for manipulating spin waves through analyses of the abnormal impurity dependence of spin waves. The review of the anomalous behaviors of spin waves and the proposed models provide the directions for easier experimental study of spin waves by inelastic light scattering, which will be useful for raising the research efforts for investigating spin waves. This is important for the emerging research of magnonics, which has received extensive interests in the modern magnetism research community.

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Section: Broad Linewidthsupporting

confidence: 90%

Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering

et al. 2019

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“…In Figure 2b, the absorption peak shows an abrupt change around the Néel temperature. Such anomalies of absorption peak shifts were observed in hexagonal RMnO 3 thin films with R = Gd, Tb, Dy, Ho and Lu [12]. These anomalies are attributed to that the electronic state is modulated by the antiferromagnetic ordering.…”

Section: Optical Transition Propertymentioning

confidence: 66%

“…Accordingly, the optical transitions occur from the e 1g and e 2g states to a 1g state [39]. It is widely considered that the absorption peak at~1.7 (2.3) eV is originated from the optical transition from the e 2g to a 1g (e 1g to a 1g ) states [12,37,39]. The absorption band shows a lower energy shift with an increase in temperature.…”

Section: Optical Transition Propertymentioning

confidence: 99%

“…Yttrium and rare-earth manganites RMnO 3 (R = Lu, Ho, Er, Tm, Yb) crystallize in a hexagonal phase with space group P6 3 cm [7]. These are multiferroic materials where the ferroelectric and antiferromagnetic characteristics coexist [8][9][10][11][12][13][14]. The ferroelectric transition temperature is 500-1000 K and the antiferromagnetic transition temperature is about 100 K. The correlation behaviour between electric and magnetic properties emerged in the temperature dependences of dielectric constant and loss tangent around the Néel temperature [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Coherent Optical Phonons in a Hexagonal YMnO3 Thin Film

Hasegawa

2019

Applied Sciences

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This paper reviews our recent study on a coherent optical phonon in a hexagonal YMnO3 thin film together with related optical studies in hexagonal RMnO3 (R = Y, Lu, Ho) compounds. Coherent phonons have been observed in RMnO3 compounds by pump-probe spectroscopy with subpicosecond laser pulses, whereas the observation of coherent optical phonons was reported only in LuMnO3. Recently, we succeeded in the observation of the coherent optical phonon in a YMnO3 thin film. The generation process of the coherent optical phonon is assigned to a displacive mechanism, which is identical to that in LuMnO3. The coherent optical phonon is observed in the temperature range from 10 K to room temperature, while the oscillation intensity strongly decreases as the temperature increases to the Néel temperature of ~70 K from a lower temperature range. It is interesting that the temperature dependence is largely different from that in LuMnO3. We describe that the result can be qualitatively explained by the property of an isostructural transition around the Néel temperature in RMnO3 compounds. In addition, we briefly discuss ultrafast incoherent responses of excited electronic states from the viewpoint of the excitation photon energy of laser pulses.

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“…study including the origins of ferroelectric ordering and antiferromagnetic (AFM) ordering, the microscopic mechanisms of the anomalous dielectric constant, blueshift of the Mn d to d transition energy (E dd ), and the magnetoelectric (ME) effect near the Néel temperature (T N ) [1][2][3][4]. In particular, through temperature-dependent high-resolution neutron scattering experiments, the ME coupling in this family of multiferroics was further identified to involve a significant magneto-elastic effect [4].…”

mentioning

confidence: 99%

Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy

Chen

Hsieh

et al. 2012

J Supercond Nov Magn

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In this paper, (001)-oriented hexagonal YMnO 3 (h-YMO) thin films with various nominal strain states were deposited on MgO(100), MgO(111), and YSZ(111) substrates by pulsed laser deposition. The in-plane orientation alignment and substrate-induced epitaxial strain between the h-YMO films and substrates are examined by X-ray diffraction (XRD) θ -2θ , Φ, and ω scans. The effects of epitaxial strain on the on-site Mn d-d transition energy E dd (T ), and the Néel temperature (T N ) in these thin films are investigated by wavelength-tunable ultrafast pump-probe techniques. We find that the changes of E dd (T ) and T N depend on the type and magnitude of the epitaxial strain. The possible mechanisms for the observed strain effect on the electronic structure and associated magnetism are discussed.

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Optical spectroscopic investigation on the coupling of electronic and magnetic structure in multiferroic hexagonalRMnO3(R=Gd, Tb, Dy, and Ho) t

Cited by 41 publications

References 32 publications

Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering

Anomalous Behaviors of Spin Waves Studied by Inelastic Light Scattering

Characteristics of Coherent Optical Phonons in a Hexagonal YMnO3 Thin Film

Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy

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