Static magnetic properties of(CH3)4NMnxCu1−xCl3, a quantum ferromagnetic chain with classical impurities: Experiment and theory

AbstractChain-of-sphere (CoS) nanostructure containing Permalloy (Fe20Ni80) nanospheres of uniform size (d=50 nm) has been studied using micromagnetic simulation. These large-size Permalloy nanospheres support magnetic vortex structure upon relaxation. The presence of magnetic vortices in CoS architecture affects its magnetic properties significantly. Micromagnetic behaviour of Permalloy CoS system was studied focusing on the magnetization reversal process. The presence of magnetic vortices triggers a vortex creation and annihilation mechanism (VCA) involving the formation and breaking of an inversion symmetry (IS) feature. This VCA mechanism has been studied using 3D micromagnetic simulation and results of coercivity and vortex parameters are presented.

Download Full-text

Design of a homonuclear ferromagnetic chain: structures and magnetic properties of oxalato-bridged copper(II) complexes with one-dimensional structures

Inorganic Chemistry ◽

10.1021/ic00041a025 ◽

1992 ◽

Vol 31 (15) ◽

pp. 3295-3301 ◽

Cited By ~ 100

Author(s):

Hiroki Oshio ◽

Umpei Nagashima

Keyword(s):

Magnetic Properties ◽

One Dimensional ◽

Ferromagnetic Chain

Download Full-text

Synthesis, crystal structure and magnetic properties of a new cyanide-bridged iron(III)–nickel(II) ferromagnetic chain

Inorganica Chimica Acta ◽

10.1016/j.ica.2008.03.044 ◽

2008 ◽

Vol 361 (14-15) ◽

pp. 3912-3918 ◽

Cited By ~ 15

Author(s):

Valeria Costa ◽

Rodrigue Lescouëzec ◽

Jacqueline Vaissermann ◽

Patrick Herson ◽

Yves Journaux ◽

...

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Ferromagnetic Chain

Download Full-text

Synthesis, Structure, and Magnetic Properties of the Oxalate-Based Bimetallic Ferromagnetic Chain {[K(18-crown-6)][Mn(H2O)2Cr(ox)3]}∞(18-crown-6 = C12H24O6, ox = C2O42-)

Inorganic Chemistry ◽

10.1021/ic050258w ◽

2005 ◽

Vol 44 (18) ◽

pp. 6197-6202 ◽

Cited By ~ 46

Author(s):

Eugenio Coronado ◽

José R. Galán-Mascarós ◽

Carlos J. Gómez-García ◽

Carlos Martí-Gastaldo

Keyword(s):

Magnetic Properties ◽

Ferromagnetic Chain

Download Full-text

Iron(II) complexes containing thiophene-substituted “bispicen” ligands — Spin-crossover, ligand rearrangements, and ferromagnetic interactions

Canadian Journal of Chemistry ◽

10.1139/v10-086 ◽

2010 ◽

Vol 88 (9) ◽

pp. 954-963 ◽

Cited By ~ 9

Author(s):

Haojin Cheng ◽

Brandon Djukic ◽

Hilary A. Jenkins ◽

Serge I. Gorelsky ◽

Martin T. Lemaire

Keyword(s):

Magnetic Properties ◽

Density Functional ◽

Spin Crossover ◽

Variable Temperature ◽

Density Functional Theory Calculations ◽

Zero Field ◽

Zero Field Splitting ◽

Magnetic Analysis ◽

Ferromagnetic Chain ◽

Ferromagnetic Interactions

The synthesis and characterization of three new tetradentate “bispicen-type” ligands containing a substituted thiophene heterocycle are described [2,5-thienyl substituents = H (7), Ph (8), or 2-thienyl (9)]. Iron(II) bis(thiocyanate) coordination complexes containing 7–9 were prepared, and the electronic and variable-temperature magnetic properties of complexes containing 7 (10) and 9 (12) are described. Complex 10 features a gradual and incomplete spin crossover in the solid state, and 12 remains high-spin over the entire temperature range. Complex 11 is extremely unstable and rearranges to another iron(II) complex (13), which was structurally characterized. The temperature-dependent magnetic properties of 13 are described as a one-dimensional ferromagnetic chain, with interchain antiferromagnetic interactions and (or) zero-field splitting dominant at low temperatures. The magnetic analysis is corroborated by the molecular packing and density functional theory calculations, which suggest intermolecular interactions between coordinated thiocyanate ligands bearing a significant spin density.

Download Full-text

AEM analysis of crystallization in Ti-based amorphous alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075142 ◽

1983 ◽

Vol 41 ◽

pp. 270-271

Author(s):

A.R. Pelton ◽

A.F. Marshall ◽

Y.S. Lee

Keyword(s):

Magnetic Properties ◽

Amorphous Alloys ◽

Amorphous Materials ◽

Isothermal Annealing ◽

Amorphous Matrix ◽

Nucleation And Growth ◽

Current Interest ◽

Amorphous Films ◽

Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Download Full-text

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100105916 ◽

1988 ◽

Vol 46 ◽

pp. 770-771

Author(s):

June D. Kim

Keyword(s):

Electron Microscopy ◽

Magnetic Properties ◽

Ternary Phase Diagram ◽

Vertical Tube ◽

Vacuum Induction Melting ◽

Induction Melting ◽

Soft Magnetic ◽

Quenching Temperature ◽

Thin Foils ◽

Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

Download Full-text