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Exploration and Engineering of Physical Properties in High-Quality Sr2CrReO6 Epitaxial Films

Lucy, Jeremy M
http://rave.ohiolink.edu/etdc/view?acc_num=osu1436888316

Abstract Details

2015, Doctor of Philosophy, Ohio State University, Physics.
Double perovskites have proven to be highly interesting materials, particularly in the past two decades, with many materials in this family exhibiting strong correlations. These materials are some of many novel complex oxides with potential spintronics application. Sr2CrReO6, in particular, is a double perovskite with one of the highest Curie temperatures of its class (> 620 K in bulk and ∼510-600 K in thin films), as well as high spin polarization, ferrimagnetic behavior, and semiconducting properties. This dissertation covers recent work in exploring and tuning physical properties in epitaxial films of Sr2CrReO6. It starts by providing a background for the field of spintronics and double perovskites, bulk and thin film synthesis of Sr2CrReO6, and standard and specialized characterization techniques utilized in both university and national laboratories, and then provides reports of work on Sr2CrReO6 epitaxial films. Examples of exploration and engineering of properties of Sr2CrReO6 include: (1) tuning of electrical resistivity, such as at T = 7 K by a factor of 18,000%, via control of oxygen partial pressure during film growth; (2) enhancement of interfacial double perovskite ordering, demonstrated with high-angle annular dark-field scanning transmission electron microscopy, via the use of double perovskite buffer layer substrates; (3) measurement of magnetization suppression near film/substrate interfaces via polarized neutron reflectometry, which reveals a reduction of thickness (from 5.6 nm to 3.6 nm) of the magnetically suppressed interface region due to buffer layer enhancement; (4) strain tunability of atomic spin and orbital moments of Cr, Re, and O atoms probed with x-ray magnetic circular dichroism, which demonstrates ferrimagnetic behavior and reveals important magnetic contributions of the oxygen sites (∼0.02 µB/site); (5) strain tunability of large magnetocrystalline anisotropy via applied epitaxial strain, revealing anisotropy fields of up to 10s of tesla; and (6) depth-resolved synchrotron x-ray studies of correlated magnetic and structural relaxation in a thick relaxing film. The utilized techniques and demonstrated results for Sr2CrReO6 will hopefully benefit researchers of complex oxide materials and perhaps stimulate further work on this and other related materials.
Fengyuan Yang (Advisor)
P. Chris Hammel (Committee Member)
Ciriyam Jayaprakash (Committee Member)
Richard Hughes (Committee Member)
233 p.
Condensed Matter Physics
double perovskite; Sr2CrReO6; SCRO; spintronics; perovskite; x-ray magnetic circular dichroism; magnetocrystalline anisotropy; magnetic anisotropy; semiconductor; ferrimagnet; synchrotron; x-ray; neutron; spallation; reflectometry

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Citations

  • Lucy, J. M. (2015). Exploration and Engineering of Physical Properties in High-Quality Sr2CrReO6 Epitaxial Films [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1436888316

    APA Style (7th edition)

  • Lucy, Jeremy. Exploration and Engineering of Physical Properties in High-Quality Sr2CrReO6 Epitaxial Films. 2015. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1436888316.

    MLA Style (8th edition)

  • Lucy, Jeremy. "Exploration and Engineering of Physical Properties in High-Quality Sr2CrReO6 Epitaxial Films." Doctoral dissertation, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1436888316

    Chicago Manual of Style (17th edition)

osu1436888316
401
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This open access ETD is published by The Ohio State University and OhioLINK.