Very large magnetoresistance in perovskite-like La-Ca-Mn-O thin films

McCormack, M.; Jin, S.; Tiefel, T. H.; Fleming, R. M.; Phillips, Julia M.; Ramesh, R.

doi:10.1063/1.111372

Cited by 441 publications

(154 citation statements)

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“…Thin films of La-Ca-Mn-O, [18][19][20][21] La-Ba-Mn-O, 22 La-(Ca,Pb)-Mn-O, 23 La-Ce-Mn-O, 24 and La-Sr-Mn-O 25 exhibit magnetoresistance in the range of 5%-150%, which is comparable to that obtained in giant magnetoresistance (GMR) metal multilayers. Jin et al and McCormack et al reported 26,27 a "colossal" magnetoresistance of more than 100 000% for epitaxial La-Ca-Mn-O films on LaAlO 3 . The origin of these enormous magnetoresistance values is unknown, although they evidently are related to the magnetic state of the system.…”

Section: Introductionmentioning

confidence: 99%

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Debnath

Kim

Heo

et al. 2013

Journal of Applied Physics

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Dou, S. X. (2013). Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film. Journal of Applied Physics, 113 (6), 063508-1-063508-6. Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film Abstract An epitaxial La0.8Ca0.2MnO3/LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-to-ferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. An epitaxial La 0.8 Ca 0.2 MnO 3 /LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-toferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. V C 2013 American Institute of Physics. [http://dx

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Section: Introductionmentioning

confidence: 99%

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Debnath

Kim

Heo

et al. 2013

Journal of Applied Physics

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“…10 With small substitutions of the perovskite crystal structure, the conductivity can be tuned from insulating toward metallic behavior, for example, for colossal magnetoresistance 11 or transparent conductors. 12 All these perovskite materials and their properties have opened access to considerable research activities and multiple applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Embedded Perovskite Nanoparticles for Enhanced Capacitor Permittivities

Krause

Weber

Pohl

et al. 2014

ACS Appl. Mater. Interfaces

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Link to publication• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACT: Growth experiments show significant differences in the crystallization of ultrathin CaTiO 3 layers on polycrystalline Pt surfaces. While the deposition of ultrathin layers below crystallization temperature inhibits the full layer crystallization, local epitaxial growth of CaTiO 3 crystals on top of specific oriented Pt crystals occurs. The result is a formation of crystals embedded in an amorphous matrix. An epitaxial alignment of the cubic CaTiO 3 ⟨111⟩ direction on top of the underlying Pt {111} surface has been observed. A reduced forming energy is attributed to an interplay of surface energies at the {111} interface of both materials and CaTiO 3 nanocrystallites facets. The preferential texturing of CaTiO 3 layers on top of Pt has been used in the preparation of ultrathin metal−insulator−metal capacitors with 5−30 nm oxide thickness. The effective CaTiO 3 permittivity in the capacitor stack increases to 55 compared to capacitors with amorphous layers and a permittivity of 28. The isolated CaTiO 3 crystals exhibit a passivation of the CaTiO 3 grain surfaces by the surrounding amorphous matrix, which keeps the capacitor leakage current at ideally low values comparable for those of amorphous thin film capacitors.

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“…and B stands for divalent alkaline-earth elements, such as Ba, Sr, etc. Materials refinements have revealed that very large magnetoresistances, of over three orders of magnitude change in resistance, can be observed in such compounds prepared through special heat-treatment (Jin et al, 1994a;Jin et al, 1994b;McCormack et al, 1994). These materials have since been refered to as colossal magnetoresistance materials, or CMR materials.…”

Section: Introductionmentioning

confidence: 99%

Thin–film trilayer manganate junctions

1998

Philosophical Transactions of the Royal Society of London. Seri

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Spin-dependent conductance across a manganate-barrier-manganate junction has recently been demonstrated. The junction is a La 0.67 Sr 0.33 MnO 3 -SrTiO 3 -La 0.67 Sr 0.33 MnO 3 trilayer device supporting current-perpendicular transport. Large magnetoresistance of up to a factor of five change was observed in these junctions at 4.2K in a relatively low field of the order of 100 Oe. Temperature and bias dependent studies revealed a complex junction interface structure whose materials physics has yet to be understood.

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Very large magnetoresistance in perovskite-like La-Ca-Mn-O thin films

Cited by 441 publications

References 16 publications

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Investigation of Embedded Perovskite Nanoparticles for Enhanced Capacitor Permittivities

Thin–film trilayer manganate junctions

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