Ferromagnetic domain nucleation and growth in colossal magnetoresistive manganite

Murakami, Yasukazu; Kasai, H.; Kim, J. J.; Mamishin, Shuichi; Shindo, Daisuke; Mori, Shigeo; Tonomura, Akira

doi:10.1038/nnano.2009.342

Cited by 116 publications

(86 citation statements)

References 32 publications

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“…The electron diffraction pattern at the bottom-right corner shows the sample is at the [100] zone axis. We noticed that the contrast of the FM nanoclusters is consistent with what observed in the La0.25Pr0.375Ca0.375MnO3 (LPCMO) system using Lorentz imaging (14), although the size of the nanoclusters in LCMO is much smaller than that in LPCMO. ‡ We here retain the CO epithet which we directly refer to the superlattice related ordering although the nature of the ordering is still controversial in manganites (see ref.…”

Section: Resultssupporting

confidence: 82%

“…nanoscale inhomogeneities | superlattice I t is widely believed that electronic inhomogeneities due to the complex spin-lattice-charge interplay (1)(2)(3)(4)(5)(6)(7)(8)(9) and the percolation of the conducting phase in manganites (10)(11)(12)(13)(14)(15)(16)(17)(18) are essential to the understanding of the colossal magnetoresistance (CMR) mechanism (19)(20)(21). However, the competing magnetic, lattice, and charge orders result in very intricate phase-separation scenarios in the materials and, therefore, it is difficult to unravel the role of individual phases in the CMR effect.…”

Section: Jingmentioning

confidence: 99%

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Role of structurally and magnetically modified nanoclusters in colossal magnetoresistance

Tao

Niebieskikwiat

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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It is generally accepted that electronic and magnetic phase separation is the origin of many of exotic properties of strongly correlated electron materials, such as colossal magnetoresistance (CMR), an unusually large variation in the electrical resistivity under applied magnetic field. In the simplest picture, the two competing phases are those associated with the material state on either side of the phase transition. Those phases would be paramagnetic insulator and ferromagnetic metal for the CMR effect in doped manganites. It has been speculated that a critical component of the CMR phenomenon is nanoclusters with quite different properties than either of the terminal phases during the transition. However, the role of these nanoclusters in the CMR effect remains elusive because the physical properties of the nanoclusters are hard to measure when embedded in bulk materials. Here we show the unexpected behavior of the nanoclusters in the CMR compound La 1−x Ca x MnO 3 (0.4 ≤ x < 0.5) by directly correlating transmission electron microscopy observations with bulk measurements. The structurally modified nanoclusters at the CMR temperature were found to be ferromagnetic and exhibit much higher electrical conductivity than previously proposed. Only at temperatures much below the CMR transition, the nanoclusters are antiferromagnetic and insulating. These findings substantially alter the current understanding of these nanoclusters on the material's functionality and would shed light on the microscopic study on the competing spin-lattice-charge orders in strongly correlated systems.nanoscale inhomogeneities | superlattice I t is widely believed that electronic inhomogeneities due to the complex spin-lattice-charge interplay (1-9) and the percolation of the conducting phase in manganites (10-18) are essential to the understanding of the colossal magnetoresistance (CMR) mechanism (19-21). However, the competing magnetic, lattice, and charge orders result in very intricate phase-separation scenarios in the materials and, therefore, it is difficult to unravel the role of individual phases in the CMR effect. Firstly, the dimension of the percolative phases that yields the CMR effect is under intensive debate. Submicron percolating network was observed using several imaging techniques (10-12), although evidence by various diffraction techniques and scanning tunneling microscopy (STM) supports nanoscale phase separation to be the key to study the CMR (3-9, 15-18). Secondly, among the nanoscale phases, a phase in form of nanoclusters with unique structural characteristic has attracted great attention because its appearance coincides with the CMR effect in a wide range of doped manganites without exception (3-9). This nanoscale phase was found to have satellite-superlattice reflections detected by neutron scattering, synchrotron X-ray, and electron diffractions during a paramagnetic (PM) to ferromagnetic (FM) phase transition upon cooling (3-9). The superstructure modulation exhibits in the nanoclusters with maximum density in...

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Section: Resultssupporting

confidence: 82%

Section: Jingmentioning

confidence: 99%

Role of structurally and magnetically modified nanoclusters in colossal magnetoresistance

Tao

Niebieskikwiat

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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“…Elucidating the competition between the energetically degenerate phases is crucial to harnessing macroscopic properties such as CMR and metal-insulator transition in such complex materials. Although manganites have been intensively studied for several decades, new insights continue to emerge on the characteristics and the dynamic evolution of magnetic domains [21][22][23], shedding light on the complex behaviors of competing phases in strongly correlated electron systems.…”

Section: Introductionmentioning

confidence: 99%

Electric field tuning of phase separation in manganite thin films

Lourembam

Ding

et al. 2014

Phys. Rev. B

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In this paper, we investigate the electric field effect on epitaxial Pr 0.65 (Ca 0.75 Sr 0.25 ) 0.35 MnO 3 thin films in electric double-layer transistors. Different from the conventional transistors with semiconducting channels, the sub(micrometer)-scale phase separation in the manganite channels is expected to result in inhomogeneous distribution of mobile carriers and local enhancement of electric field. The field effect is much larger in the low-temperature phase separation region compared to that in the high-temperature polaron transport region. Further enhancement of electroresistance is achieved by applying a magnetic field, and a 250% modulation of resistance is observed at 80 K, equivalent to an increase of the ferromagnetic metallic phase fraction by 0.51%, as estimated by the general effective medium model. Our results illustrate the complementary nature of electric and magnetic field effects in phase-separated manganites, providing insights on such novel electronic devices based on complex oxides.

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“…A more recent application example is the observation of the nucleation and growth of ferromagnetic domains in colossal magnetoresistance (CMR) materials (Murakami et al, 2009). In CMR, an electric current begins to flow when the magnetic field increases or the temperature decreases.…”

Section: Applications Of Electron Holographic Interferometrymentioning

confidence: 99%

Fundamentals and Applications of Electron Holography

Tonomura¹

2011

Holography, Research and Technologies

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Ferromagnetic domain nucleation and growth in colossal magnetoresistive manganite

Cited by 116 publications

References 32 publications

Role of structurally and magnetically modified nanoclusters in colossal magnetoresistance

Role of structurally and magnetically modified nanoclusters in colossal magnetoresistance

Electric field tuning of phase separation in manganite thin films

Fundamentals and Applications of Electron Holography

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