Evolution and control of the phase competition morphology in a manganite film

Zhou, Haibiao; Wang, Lingfei; Hou, Yubin; Huang, Zhen; Lu, Qingyou; Wu, Wenbin

doi:10.1038/ncomms9980

Cited by 50 publications

(63 citation statements)

References 34 publications

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“…Meanwhile, magnetic force microscopy (MFM) provides a nano-resolved probe of local magnetic moments in ferro-and ferrimagnets, routinely applied to visualize magnetic phase separation in manganites 16,22,23 . Using a magnetic near-field probe, we combine both SNOM and MFM techniques for collocated multi-messenger imaging of nano-scale magnetic and optical properties across the IMT.…”

Section: Multi-messenger Nano-probes and Photo-excitation Of Hidden Fermentioning

confidence: 99%

Multi-messenger nanoprobes of hidden magnetism in a strained manganite

McLeod

Zhang

et al. 2019

Nat. Mater.

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The ground state properties of correlated electron systems can be extraordinarily sensitive to external stimuli, such as temperature, strain, and electromagnetic fields, offering abundant platforms for functional materials. We present a metastable and reversible photoinduced ferromagnetic transition in strained films of the doped manganite La2/3Ca1/3MnO3 (LCMO). Using the novel multi-messenger combination of atomic force microscopy, cryogenic scanning near-field optical microscopy, magnetic force microscopy, and ultrafast laser excitation, we demonstrate both "writing" and "erasing" of a metastable ferromagnetic metal phase with nanometer-resolved finesse. By tracking both optical conductivity and magnetism at the nano-scale, we reveal how spontaneous strain underlies the thermal stability, persistence, and reversal of this photoinduced metal. Our firstprinciples electronic structure calculations reveal how an epitaxially engineered Jahn-* These authors contributed equally to the present work. Corresponding author: † am4734@columbia.edu 2 Teller distortion can stabilize nearly degenerate antiferromagnetic insulator and ferromagnetic metal phases. We propose a Ginzburg-Landau description to rationalize the co-active interplay of strain, lattice distortion, and magnetism we resolve in strained LCMO, thus guiding future functional engineering of epitaxial oxides like manganites into the regime of phase-programmable materials. Ultrafast all-optical control of the insulator-metal transition in correlated electron systems 1 remains a coveted route towards reconfigurable functional materials. 2 Although transient photoinduced phase transitions can expose interactions among competing orders in complex systems, 3 persistent all-optical and reversible switching is desirable for ondemand device functionalities. 4 For example, the colossal magnetoresistive (CMR) manganites (AE1-xRExMnO3, AE: alkali earth, RE: rare earth) show magnetic and electronic properties that depend strongly on the microscopic geometrical configuration of the comprising MnO6 octahedral network. 5-8 This pliancy affords fertile ground for photoinduced manipulation of the equilibrium state. 9,10 In particular, the accompaniment of magnetism by spontaneous strain in Ca-doped La1-xCaxMnO3 11,12 raises the possibility for interplay between strain-coupling (often termed "coelasticity" 13 ) in this compound and the photoinduced insulator-metal transition. 14 Here we study a 26 nm thick La2/3Ca1/3MnO3 (LCMO) thin film grown on NdGaO3 (001) substrate. 15 Although first exhibiting a lowtemperature insulator to metal transition (IMT) common to the bulk system at T~250K, annealing these films in an oxygen environment coherently accommodates their epitaxy to the NdGaO3 substrate, stabilizing a persistent antiferromagnetic insulating (AFI) phase. 15 Strikingly, these insulating LCMO films show extreme susceptibility to ultra-short pulsed laser excitation (<200 fs), driving a persistent phase transition into a metallic state. 14 Although the IMT in rare-earth mangani...

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Section: Multi-messenger Nano-probes and Photo-excitation Of Hidden Fermentioning

confidence: 99%

Multi-messenger nanoprobes of hidden magnetism in a strained manganite

McLeod

Zhang

et al. 2019

Nat. Mater.

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“…Probes have been developed for Atomic Force Microscopy (AFM) and related SPM techniques at cryogenic temperatures and in magnetic fields [1][2][3][4] , which have enabled novel properties of magnetic and multiferroic domain walls to be explored 5,6 . Magnetic Force Microscopy (MFM) has been used to image spatially inhomogeneous magnetic textures such as skyrmions 7 and bubble domains 8,9 , and can also be used to image phase coexistence at metamagnetic phase transitions 10,11 . However, since almost all SPM setups to date have utilized laboratory superconducting magnets, the maximum field has been limited to 20 T 3 .…”

Section: Introductionmentioning

confidence: 99%

An ultra-compact low temperature scanning probe microscope for magnetic fields above 30 T

Rossi

Gerritsen

Nelemans

et al. 2018

Review of Scientific Instruments

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We present the design of a highly compact High Field Scanning Probe Microscope (HF-SPM) for operation at cryogenic temperatures in an extremely high magnetic field, provided by a water-cooled Bitter magnet able to reach 38 T. The HF-SPM is 14 mm in diameter: an Attocube nano-positioner controls the coarse approach of a piezo resistive AFM cantilever to a scanned sample. The Bitter magnet constitutes an extreme environment for SPM due to the high level of vibrational noise; the Bitter magnet noise at frequencies up to 300 kHz is characterized and noise mitigation methods are described. The performance of the HF-SPM is demonstrated by topographic imaging and noise measurements at up to 30 T. Additionally, the use of the SPM as a three-dimensional dilatometer for magnetostriction measurements is demonstrated via measurements on a magnetically frustrated spinel sample.

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“…7 Early investigations have revealed that the coexisting phases are controllable by electronic phase engineering. 8 The engineering method includes chemical doping, thermal annealing, electrical and/or magnetic field treatment, etc. [9][10][11]12 As a well investigated electron system, La3/8-yPryCa3/8MnO3 owns a martensitic-like electronic phase transition between the AFM/COI and the FMM phase.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11]12 As a well investigated electron system, La3/8-yPryCa3/8MnO3 owns a martensitic-like electronic phase transition between the AFM/COI and the FMM phase. 6,8 The martensitic-like phase transition allows for the coexistence of AFM/COI and FMM phase at nanometer or submicrometer scale and determines the formation of a electronic phase separation state. 13,14 Due to the vivid competition between the coexisting phases, a small external stimulus can give a remarkable change of the electronic phase separation state.…”

Section: Introductionmentioning

confidence: 99%

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Electronic phase engineering induced thermoelectric enhancement in manganites

Jia

Wang

Yan

et al. 2018

Journal of Applied Physics

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The nano-structuring engineering and the introduction of magnetic scattering are effective ways to enhance the thermoelectric performance. In this work, we use the magnetic treatments on La0.4Pr0.225Ca0.375MnO3 to demonstrate that the electronic phase engineering can enhance the thermoelectric performance by simultaneously reducing the thermal conductivity and raising the power factor in a strongly correlated electron system. The study indicates that the magnetic treatment changes the phase separation state and impedes the growth of ferromagnetic metal (FMM) phase. The decrease of FMM phase miniatures the FMM domain sizes and suppresses the bipolar effect, which raises the Seebeck coefficient and the power factor, reduces the thermal conductivity, and therefore enhances the thermoelectric performance.

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Evolution and control of the phase competition morphology in a manganite film

Cited by 50 publications

References 34 publications

Multi-messenger nanoprobes of hidden magnetism in a strained manganite

Multi-messenger nanoprobes of hidden magnetism in a strained manganite

An ultra-compact low temperature scanning probe microscope for magnetic fields above 30 T

Electronic phase engineering induced thermoelectric enhancement in manganites

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