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Toreh, K.R.N.,Kim, D.H.,Dash, U.,Phan, T.L.,Lee, B.W.,Jin, H.W.,Lee, S.,Park, B.H.,Park, J.Y.,Cho, M.R.,Park, Y.D.,Acharya, S.K.,Yoo, W.,Jung, M.H.,Jung, C.U. Elsevier Sequoia 2016 Journal of alloys and compounds Vol.657 No.-
SrRu<SUB>1-x</SUB>Fe<SUB>x</SUB>O<SUB>3-δ</SUB> (x = 0.00, 0.05, 0.10, and 0.20) thin films were fabricated to study the intrinsic aspects of a ''self spin valve''. Using epitaxial strain and high oxygen partial pressure during thin film growth, single phase thin films with negligible oxygen vacancies were successfully grown, and problems related to A-site disorder and grain boundaries were minimized. Under application of an external magnetic field of up to 9 T, the resistivity of all films decreased, resulting in large negative magnetoresistance (up to ~14.4%), which was stronger at temperatures in the range 10-30 K. An abrupt metal-insulator transition at T~ 43 K was found in the x = 0.20 film, which was explained using a two-fluid model related to electron-electron interactions. From the model, two fitting parameters were found to be necessary for in-situ and homogenous defects, while three or unphysical fitting parameters were necessary for ex-situ and inhomogeneous defects.
Magnetic properties of SrRu0.9Fe0.1O3 thin films grown on different surfaces of SrTiO3 substrates
Kirstie Raquel Natalia Toreh,이민영,Octolia Togibasa Tambunan,Deokhyeon Kim,이보화,정창욱 한국물리학회 2014 Current Applied Physics Vol.14 No.8
We stabilized SrRu0.9Fe0.1O3 single-crystalline films on SrTiO3 (001) and SrTiO3 (110) substrates using epitaxial strain during thin-film growth. X-ray diffraction (XRD) qe2q scans showed strong peaks demonstrating single-crystal quality. Fe doping in SrRuO3 had negative effects on the ferromagnetic properties, such as decreasing the Tc and saturated magnetic moment, as well as weakening the ferromagnetism. The negative effects were reduced when a suitable surface of the cubic substrate was selected for thin-film SrRuO3 growth. We found that the ferromagnetic properties, such as the Tc and saturated magnetic moment, differed depending on the substrate surface. The observed differences are discussed in terms of RueRu nearest-neighbor distance.
Magnetic and electric properties of stoichiometric BiMnO <sub>3</sub> thin films
Lee, Bo Wha,Yoo, Pil Sun,Nam, Vu Binh,Toreh, Kirstie Raquel Natalia,Jung, Chang Uk Springer US 2015 NANOSCALE RESEARCH LETTERS Vol.10 No.1
<P>It has been suggested that BiMnO<SUB>3</SUB> is a material exhibiting both ferromagnetism and ferroelectricity. Stoichiometry is rather easily achieved in a polycrystalline sample, and ferromagnetic properties have been well documented for bulk samples. Stoichiometry in thin films has been difficult to obtain, and many physical properties have exhibit wide distributions mainly due to the stoichiometry problem. Thin film studies on BiMnO<SUB>3</SUB> have not shown clear evidence of ferroelectricity, while other physical properties measured for the BiMnO<SUB>3</SUB> films showed wide spectra, which has been attributed to cation and/or oxygen vacancies. We fabricated BiMnO<SUB>3</SUB> thin films with good stoichiometry and with ferromagnetic properties comparable to those reported for stoichiometric BiMnO<SUB>3</SUB>: <I>Tc</I> ~ 105 K and <I>M</I><SUB>sat</SUB> ~ 3.6 μ<SUB>B</SUB>/Mn. The charge-electric field (Q-E) curve measured at 5 K was fairly linear and free from hysteresis and showed no ferroelectric order. This finding is consistent with the centrosymmetric crystal structure recently suggested by theoretical calculations and structural studies on ceramic samples of stoichiometric BiMnO<SUB>3</SUB>.</P>