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Full-Text Articles in Physics
Structure, Magnetic Properties, And Exchange Coupling In Thermally Processed Nddyfecob/Α-Fe Nanoscale Multilayer Magnets, W. Liu, Xingzhong Li, Y. C. Sui, J. Zhou, W. J. Ren, Z. D. Zhang, David J. Sellmyer
Structure, Magnetic Properties, And Exchange Coupling In Thermally Processed Nddyfecob/Α-Fe Nanoscale Multilayer Magnets, W. Liu, Xingzhong Li, Y. C. Sui, J. Zhou, W. J. Ren, Z. D. Zhang, David J. Sellmyer
David Sellmyer Publications
The structure and magnetic properties of multilayer magnets with a hard phase (HP1 =NdM13.5Dy1.5Fe68Co107 or HP2=Nd14Dy1Fe68Co10B7) and soft phase Fe, prepared by sputtering and subsequent heat treatment, have been investigated. For Si/Ti(20 nm)/[HP1(2.0 nm)/Fe(0.5 nm)] x 200/Ti(10 nm) multilayer film, transmission electron microscopy results show that Fe disperses in amorphous NdDyFeCoB alloy. After annealing at 575 °C for 5 min, the hard Nd2Fe14B phase typically with grains of about 50 nm and some amount of α-Fe coexist in the …
Synthesis And Magnetic Characterizations Of Manganite-Based Composite Nanoparticles For Biomedical Applications, Aswini K. Pradhan, R. Bah, R. B. Konda, R. Mundle, H. Mustafa, O. Bamiduro, Rakhim R. Rakhimov, Xiaohui Wei, David J. Sellmyer
Synthesis And Magnetic Characterizations Of Manganite-Based Composite Nanoparticles For Biomedical Applications, Aswini K. Pradhan, R. Bah, R. B. Konda, R. Mundle, H. Mustafa, O. Bamiduro, Rakhim R. Rakhimov, Xiaohui Wei, David J. Sellmyer
David Sellmyer Publications
We report chemically synthesized highly crystalline lanthanum strontium manganite (LaSrMnO3) and Eu-doped Y2O3 and their composites. The synthesis yields nanoparticles of size 30–40 nm. Magnetic measurements performed on nanoparticles and composites show magnetic transition at about 370 K with a superparamagnetic behavior at room temperature. The ferromagnetic resonance studies of the nanoparticles show large linewidth due to surface strains. The composite nanoparticles also display luminescent behavior when irradiated with ultraviolet light. The manganites as well their composite with the luminescent nanoparticles may be very useful for biomedical applications.
Magnetic Properties Of La0.60Sr0.40Mno3 Thin Films On Srtio3 And Buffered Si Substrates With Varying Thickness, Aswini K. Pradhan, D. Hunter, T. Williams, B. Lasley-Hunter, R. Bah, H. Mustafa, Rakhim R. Rakhimov, J. Zhang, David J. Sellmyer, E. E. Carpenter, D. R. Sahu, J.-L. Huang
Magnetic Properties Of La0.60Sr0.40Mno3 Thin Films On Srtio3 And Buffered Si Substrates With Varying Thickness, Aswini K. Pradhan, D. Hunter, T. Williams, B. Lasley-Hunter, R. Bah, H. Mustafa, Rakhim R. Rakhimov, J. Zhang, David J. Sellmyer, E. E. Carpenter, D. R. Sahu, J.-L. Huang
David Sellmyer Publications
La0.60Sr0.40MnO3 (LSMO) thin films of varying thickness from 12 to 55 nm were deposited using the pulsed-laser deposition technique onto single-crystalline SrTiO3 (STO) and STO-buffered Si substrates. The T c of LSMO films grown on STO-buffered Si substrates decreases faster than films directly grown on STO with decreasing film thickness. The LSMO/STO film with thickness of 55 nm shows T c at about 360 K, which is close to the bulk value, whereas T c LSMO film on STO-buffered Si film of similar thickness is reduced to 320 K. This difference is attributed to …
Tem/Qed Study Of Fept Ultrathin Films And Co/Coo Core-Shell Particles, Xingzhong Li, T. George, X. H. Wei, David J. Sellmyer
Tem/Qed Study Of Fept Ultrathin Films And Co/Coo Core-Shell Particles, Xingzhong Li, T. George, X. H. Wei, David J. Sellmyer
David Sellmyer Publications
Transmission electron microscopy (TEM) imaging and electron diffraction (ED) techniques are widely used in the studies of thin films and nanoparticles. Although various advanced techniques have been well established, such as high-resolution electron microscopy (HREM) and convergent beam electron diffraction (CBED), the conventional TEM imaging and selected-area electron diffraction (SAED) techniques remain the essential methods for microstructure and crystal structure characterization. Digital TEM image processing and quantitative ED analysis (QED) has become one trend for improvements. Recently computer programs [1,2] have been developed for analysis of SAED patterns of polycrystalline phases. In this paper, we report the preliminary results on …