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The Effects of Codoping of Be and Mg on Incorporation of Mn in GaAs
Yu, Fucheng,Gao, Cunxu,Parchinskiy, P.B.,Chandra, Sekar.P.V.,Kim, Do-Jin,Kim, Chang-Soo,Kim, Hyo-Jin,Ihm, Young-Eon Materials Research Society of Korea 2008 한국재료학회지 Vol.18 No.8
Samples of GaMnAs, GaMnAs codoped with Be, and GaMnAs simultaneously codoped with Be and Mg were grown via low-temperature molecular beam epitaxy (LT-MBE). Be codoping is shown to take the Ga sites into the lattice efficiently and to increase the conductivity of GaMnAs. Additionally, it shifts the semiconducting behavior of GaMnAs to metallic while the Mn concentration in the GaMnAs solid solution is reduced. However, with simultaneous codoping of GaMnAs with Be and Mg, the Mn concentration increases dramatically several times over that in a GaMnAs sample alone. Mg and Be are shown to eject Mn from the Ga sites to form MnAs and MnGa precipitates.
A Mössbauer study of a Ge–Fe thin film
Ahn, G. Y.,Kim, C. S.,Lim, S. H. WILEY-VCH Verlag 2007 Physica status solidi. PSS. C, Current topics in s Vol.4 No.12
<P>Magnetic phases of a Ge<SUB>48.2</SUB>Fe<SUB>51.8</SUB> (in atomic%) thin film, fabricated by thermal co-evaporation onto an oxidized Si substrate, are analyzed by Mössbauer spectroscopy as well as magnetometry. Magnetic measurements indicate a superparamagnetic behavior due to the formation of Fe precipitates in an amorphous matrix with an average blocking temperature of 160 K and a spin glass behavior with a spin freezing temperature of 30 K. The superparamagnetic behavior is confirmed from the Mössbauer spectra taken at room temperature. The isomer-shift values indicate that the Fe atom in the amorphous phase is in the high-spin Fe<SUP>3+</SUP> charge state. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Magnetic properties of Mn-doped Bi<sub>2</sub>Te<sub>3</sub> and Sb<sub>2</sub>Te<sub>3</sub>
Choi, Jeongyong,Choi, Sungyoul,Choi, Jiyoun,Park, Yongsup,Park, Hyun-Min,Lee, Hee-Woong,Woo, Byung-Chul,Cho, Sunglae WILEY-VCH Verlag 2004 Physica status solidi. PSS. B, Basic solid state p Vol.241 No.7
<P>We have fabricated Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> single crystals by the vertical gradient solidification method. The compositions and crystal structures of Bi<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> and Sb<SUB>2−x</SUB>Mn<SUB>x</SUB>Te<SUB>3</SUB> were determined using Electron Probe Micro-Analyzer (EPMA) and powder X-ray diffraction (XRD) patterns, respectively. Both crystal structures were rhombohedral with smaller lattice constants because of the smaller atomic radius of Mn than those of Bi and Sb. Based on the magnetization measurements, Mn-doped Bi<SUB>2</SUB>Te<SUB>3</SUB> and Sb<SUB>2</SUB>Te<SUB>3</SUB> compounds have ferromagnetic ordering at T<SUB>C</SUB> = 10 and 17 K, respectively. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Chandradass, J.,Balasubramanian, M.,Kumar, S.,Bae, D.S.,Kim, K.H. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.1
Observation of room temperature ferromagnetism in Fe doped In<SUB>2</SUB>O<SUB>3</SUB> samples (In<SUB>1-x</SUB>Fe<SUB>x</SUB>)<SUB>2</SUB>O<SUB>3</SUB> (0=<x=<0.07) prepared by co-precipitation technique is reported. Lattice parameter obtained from powder X software shows distinct shrinkage of the lattice constant indicating an actual incorporation of Fe ions into the In<SUB>2</SUB>O<SUB>3</SUB> lattice. X-ray diffraction data measurements show that the entire sample exhibits single phase polycrystalline behavior. SEM micrographs showed the prepared powder was in the range 25-36nm. SEM EDS mapping showed the presence of Fe and In ions in the Fe doped In<SUB>2</SUB>O<SUB>3</SUB> sample. The highest remanence magnetization moment (6.624x10<SUP>-4</SUP>emu/g) is reached in the sample with x=0.03.
Electronic and magnetic properties of digitally Ti doped InP: A first principles study
Rahman, Gul,Cho, Sunglae,Hong, Soon Cheol WILEY-VCH Verlag 2008 Physica status solidi. PSS. A, Applications and ma Vol.205 No.8
<P>Using the full-potential linearized augmented plane wave method within the generalized gradient approximation, we study the electronic and the magnetic properties of digitally Ti doped InP. It is quite interesting that digitally Ti-doped InP system shows half metallic ferromagnetism even though both bulk zinc blende TiP and InP are paramagnetic. We also investigate the electronic and the magnetic properties as a function of spacer layer thickness. Their properties such as exchange coupling constant and atomic projected density of states are more or less independent of the InP thickness. Spin density contour maps indicate that the spin-polarization is confined within the TiP plane. The system may show a highly anisotropic property in spin-polarized transport. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Enhanced ferromagnetic properties of diluted Fe doped ZnO with an Al co-doping
Ahn, Geun Young,Park, Seung-Iel,Kim, Chul Sung WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.12
<P>Al-added Zn<SUB>0.99-x</SUB>Fe<SUB>x</SUB>Al<SUB>0.01</SUB>O (x = 0, 0.02, 0.05) powders were prepared with an annealing in an Ar atmosphere at 1200 °C. All the peaks from the X-ray diffraction patterns of the samples belonged to the hexagonal (P6<SUB>3</SUB>mc) lattice of ZnO, and no indication of a secondary phase was found. The lattice parameters for the Zn<SUB>0.94</SUB>Fe<SUB>0.05</SUB>Al<SUB>0.01</SUB>O were a<SUB>0</SUB> = 3.254 Å and c<SUB>0</SUB> = 5.209 Å at room temperature. The hysteresis curve for the Zn<SUB>0.94</SUB>Fe<SUB>0.05</SUB>Al<SUB>0.01</SUB>O at room temperature revealed a ferromagnetic phase. The temperature dependency of the magnetization curve was measured from 60 to 350 K and revealed that the Curie temperature was above room temperature. In this study we demonstrated an enhanced ferromagnetic behavior due to an electric property change with an Al co-doping effect. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>