Electronic Origin of Ultrafast Photoinduced Strain in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Wen, Haidan; Chen, Pice; Cosgriff, Margaret P.; Walko, Donald A.; Lee, June Hyuk; Adamo, Carolina; Schaller, Richard D.; Ihlefeld, Jon F.; Đufresne, Eric M.; Schlom, D. G.; Evans, Paul G.; Freeland, J. W.; Li, Yuelin

doi:10.1103/physrevlett.110.037601

Cited by 120 publications

(141 citation statements)

References 27 publications

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“…Additional support can be found in Ref. [44], where photoinduced changes in the lattice constants of a BFO film were discovered using time-resolved x-ray diffraction with above-gap excitation, but not observed when using a 1.55 eV pump.…”

Section: Appendix B: Exclusion Of Other Possible Contributions To Ourmentioning

confidence: 60%

“…[14] measured no change in the valence state of Fe 3þ . Photostriction has previously been observed in BFO [46] but is unlikely to affect our results, since both our previous experiments [43] and time-resolved x-ray diffraction [44] on BFO measured no response upon ∼1.5 eV excitation. Finally, the difference in thermal diffusion between BFO/STO and STO (a factor of ∼5) is also unlikely to influence our results, since the high-temperature data (≥ 165 K) on both samples is very similar (Fig.…”

mentioning

confidence: 67%

“…First, we note that the ΔR=R signal in LCMO/BFO must be due to photoinduced changes in the LCMO layer, since the band gap of BFO is greater than 2.6 eV, preventing it from being directly photoexcited with our 1.59 eV pump photons [43,44]. In addition, we expect that the temperature-dependent DSWT in optimally doped LCMO should stay the same when changing the material underneath, as long as no novel interface state is formed.…”

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confidence: 99%

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Polaronic Transport Induced by Competing Interfacial Magnetic Order in aLa0.7Ca0.3MnO3/BiFe

Sheu

Trugman

et al. 2014

Phys. Rev. X

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Using ultrafast optical spectroscopy, we show that polaronic behavior associated with interfacial antiferromagnetic order is likely the origin of tunable magnetotransport upon switching the ferroelectric polarity in a La 0.7 Ca 0.3 MnO 3 =BiFeO 3 (LCMO/BFO) heterostructure. This is revealed through the difference in dynamic spectral weight transfer between LCMO and LCMO/BFO at low temperatures, which indicates that transport in LCMO/BFO is polaronic in nature. This polaronic feature in LCMO/BFO decreases in relatively high magnetic fields due to the increased spin alignment, while no discernible change is found in the LCMO film at low temperatures. These results thus shed new light on the intrinsic mechanisms governing magnetoelectric coupling in this heterostructure, potentially offering a new route to enhancing multiferroic functionality. The quest to achieve strong magnetoelectric coupling has driven the surge in research on multiferroic materials over the past decade. However, this has been quite difficult to accomplish using bulk materials, motivating researchers to explore other approaches, most notably the use of transition metal oxide heterostructures [1][2][3]. In these novel systems, different degrees of freedom (DOFs) (e.g., charge, spin, and orbital) are coupled at a single interface between two different oxide layers to form a new state that displays properties dramatically different from those of the individual layers [4][5][6][7][8]. Particular attention has been given to the coupling between ferromagnetic (FM), antiferromagnetic (AFM), and ferroelectric (FE) orders, as this could reveal new routes to realizing strong magnetoelectric coupling [1][2][3][9][10][11].Heterostructures consisting of manganite and multiferroic layers are particularly promising in this regard. The most extensively studied combination [2,3,9,10,12] consists of the colossal magnetoresistive manganite La 0.7 Sr 0.3 MnO 3 (LSMO) [or the similar compound La 0.7 Ca 0.3 MnO 3 (LCMO)], which is ferromagnetic below a critical temperature T c , and the canonical multiferroic BiFeO 3 (BFO), which has coexisting coupled AFM and FE phases in which the magnetization can be switched by an applied electric (E) field [13]. The combination of these materials thus has great potential for exhibiting novel phenomena by coupling different FM, AFM, and FE phases across the interface. Indeed, a new interfacial state between LSMO and BFO has been discovered experimentally and discussed theoretically [2,[14][15][16]. This state displays an exchange-bias field and magnetotransport that can be tuned by switching the FE polarization, increasing the potential for device control through interfacial coupling. However, a complete picture of the interplay between FM and AFM orders in this heterostructure has yet to be reached.Current understanding of the exchange-bias field, which arises from the interaction between FM and G-type AFM [AFMðGÞ] orders at the interface, is based on spin canting or pinning in BFO, with the assumption of negligible canting in ...

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Section: Appendix B: Exclusion Of Other Possible Contributions To Ourmentioning

confidence: 60%

mentioning

confidence: 67%

mentioning

confidence: 99%

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Polaronic Transport Induced by Competing Interfacial Magnetic Order in aLa0.7Ca0.3MnO3/BiFe

Sheu

Trugman

et al. 2014

Phys. Rev. X

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“…9,16,25 In the restrained thermal expansion, the thermal strains were measured in a laser-pump Xray-probe style [26][27][28][29] , as shown in Fig. 1 30,31 and that of the h-LuFeO 3 film (2.0 eV) 25,32 .…”

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confidence: 99%

Effects of biaxial strain on the improper multiferroicity inh−LuFeO3films studied using the restrained thermal expansion method

et al. 2017

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Elastic strain is potentially an important approach in tuning the properties of the improperly multiferroic hexagonal ferrites, the details of which have however been elusive due to the experimental difficulties. Employing the method of restrained thermal expansion, we have studied the effect of isothermal biaxial strain in the basal plane of h-LuFeO3 (001) films. The results indicate that a compressive biaxial strain significantly enhances the ferrodistortion, and the effect is larger at higher temperatures. The compressive biaxial strain and the enhanced ferrodistortion together, cause an increase in the electric polarization and a reduction in the canting of the weak ferromagnetic moments in h-LuFeO3, according to our first principle calculations. These findings are important for understanding the strain effect as well as the coupling between the lattice and the improper multiferroicity in h-LuFeO3. The experimental elucidation of the strain effect in h-LuFeO3 films also suggests that the restrained thermal expansion can be a viable method to unravel the strain effect in many other epitaxial thin film materials.

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“…18,19 The dynamics of photo-induced strain was directly and quantitatively measured in a synchrotron-based ultrafast X-ray diffraction. 20 One of the most straightforward implementations of ultrafast spectroscopy is the hot electron transient relaxation following the photo-excitation. 21 In general, as the temperature is lower than the one of a succession of phase transitions, besides the conventional electron-phonon relaxation, additional scattering channels will modify the charge transport and relaxation dynamics.…”

mentioning

confidence: 99%

Temperature dependent photoexcited carrier dynamics in multiferroic BiFeO3 film: a hidden phase transition

Zhang

Jin

Pan

et al. 2014

Seventh International Symposium on Ultrafast Phenomena and Terahertz Waves

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Electronic Origin of Ultrafast Photoinduced Strain inBiFeO3

Cited by 120 publications

References 27 publications

Polaronic Transport Induced by Competing Interfacial Magnetic Order in aLa0.7Ca0.3MnO3/BiFe

Polaronic Transport Induced by Competing Interfacial Magnetic Order in aLa0.7Ca0.3MnO3/BiFe

Effects of biaxial strain on the improper multiferroicity inh−LuFeO3films studied using the restrained thermal expansion method

Temperature dependent photoexcited carrier dynamics in multiferroic BiFeO3 film: a hidden phase transition

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