Experimental and Theoretical Analyses of the Structural, Electronic, and Magnetic Properties of Novel Inverted Core-shell A-Cr2O3@a-MxCr2-xO3-y (M PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Experimental and Theoretical Analyses of the Structural, Electronic, and Magnetic Properties of Novel Inverted Core-shell A-Cr2O3@a-MxCr2-xO3-y (M PDF full book. Access full book title Experimental and Theoretical Analyses of the Structural, Electronic, and Magnetic Properties of Novel Inverted Core-shell A-Cr2O3@a-MxCr2-xO3-y (M by Mohammad Delower Hossain. Download full books in PDF and EPUB format.
Author: Mohammad Delower Hossain Publisher: ISBN: Category : Antiferromagnetism Languages : en Pages : 192
Book Description
I used hydrothermal nano-phase epitaxy technique to synthesize well-ordered a-Cr2O3@a-MxCr2-xO3 (M=Co, Ni, Mn, Fe) inverted core-shell nanoparticles (NPs). This resulted in the formation of novel a-MxCr2-xO3 shells having ferromagnetic/ferrimagnetic (FM/FiM) spin ordering and an antiferromagnetic (AFM) a-Cr2O3 core structure. The combined results from Xray diffraction (XRD) and high resolution transmission electron microscoy (HRTEM) provide evidence of the presence of the corundum phase both in the shell and in the core regions. HRTEM results also show a sharp interface exhibiting epitaxial atomic registry of shell atoms over highly ordered core atoms whereas TEM-Energy dispersive spectroscopy analyses show that the M atoms reside in the shell regions. The Xray photoelectron spectroscopy (XPS) analyses of the NPs indicate the M transition metal is in +2 oxidation state. Magnetic measurements show well-developed hysteresis loops: the field cooled hysteresis loops reveal horizontal shifts in the applied field axis and vertical shifts in the magnetization axis, relative to the zero-field cooled hysteresis loops. This provides direct evidence for the exchange bias effect between the AFM a-Cr2O3 core and the FM/FiM a-MxCr2-xO3 shell. My first principles density functional theory calculations show that the incorporation of Ni2+ in a-Cr2O3 results in localized FM ordering in the structure.
Author: Mohammad Delower Hossain Publisher: ISBN: Category : Antiferromagnetism Languages : en Pages : 192
Book Description
I used hydrothermal nano-phase epitaxy technique to synthesize well-ordered a-Cr2O3@a-MxCr2-xO3 (M=Co, Ni, Mn, Fe) inverted core-shell nanoparticles (NPs). This resulted in the formation of novel a-MxCr2-xO3 shells having ferromagnetic/ferrimagnetic (FM/FiM) spin ordering and an antiferromagnetic (AFM) a-Cr2O3 core structure. The combined results from Xray diffraction (XRD) and high resolution transmission electron microscoy (HRTEM) provide evidence of the presence of the corundum phase both in the shell and in the core regions. HRTEM results also show a sharp interface exhibiting epitaxial atomic registry of shell atoms over highly ordered core atoms whereas TEM-Energy dispersive spectroscopy analyses show that the M atoms reside in the shell regions. The Xray photoelectron spectroscopy (XPS) analyses of the NPs indicate the M transition metal is in +2 oxidation state. Magnetic measurements show well-developed hysteresis loops: the field cooled hysteresis loops reveal horizontal shifts in the applied field axis and vertical shifts in the magnetization axis, relative to the zero-field cooled hysteresis loops. This provides direct evidence for the exchange bias effect between the AFM a-Cr2O3 core and the FM/FiM a-MxCr2-xO3 shell. My first principles density functional theory calculations show that the incorporation of Ni2+ in a-Cr2O3 results in localized FM ordering in the structure.
Author: J. Ping Liu Publisher: Springer Science & Business Media ISBN: 0387856005 Category : Science Languages : en Pages : 731
Book Description
Nanoscale Magnetic Materials and Applications covers exciting new developments in the field of advanced magnetic materials. Readers will find valuable reviews of the current experimental and theoretical work on novel magnetic structures, nanocomposite magnets, spintronic materials, domain structure and domain-wall motion, in addition to nanoparticles and patterned magnetic recording media. Cutting-edge applications in the field are described by leading experts from academic and industrial communities. These include new devices based on domain wall motion, magnetic sensors derived from both giant and tunneling magnetoresistance, thin film devices in micro-electromechanical systems, and nanoparticle applications in biomedicine. In addition to providing an introduction to the advances in magnetic materials and applications at the nanoscale, this volume also presents emerging materials and phenomena, such as magnetocaloric and ferromagnetic shape memory materials, which motivate future development in this exciting field. Nanoscale Magnetic Materials and Applications also features a foreword written by Peter Grünberg, recipient of the 2007 Nobel Prize in Physics.
Author: Mohammad Delower Hossain
Author: Mohammad Delower Hossain
Author: J. Ping Liu