Molecular Clusters of 3D and Lower Magnetic Dimensionality

1990 ◽  
Vol 206 ◽  
Author(s):  
G. C. Papaefthymiou
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Molecular Clusters ◽  
Magnetic Interactions ◽  
Iron Ions ◽  
Controlled Polymerization ◽  
Magnetic Correlations

ABSTRACTControlled polymerization of iron leads to the synthesis of molecular clusters of ever-increasing size, tending to extended structures. Polymerization of oxo-bridged octahedrally coordinated iron leads to clusters with 3D magnetic interactions between iron ions, while sulfide- and selenide-bridged tetrahedrally coordinated iron ions produce clusters of lower magnetic dimensionality. The magnetic properties of the resulting large molecular clusters with N ≥ 17 (where N = the number of iron ions in the cluster) are being investigated for the presence of collective magnetic correlations associated with the solid state.

New Insights Into the Electronic-Structures of Solid-State Dioxygen Adducts of N,N′-Ethylenebis(Salicylaldiminato)Cobalt(II), Co(Salen), and of Active Precursors

1986 ◽  
Vol 39 (9) ◽  
pp. 1479 ◽  
Author(s):  
KS Murray ◽  
A Vandenbergen ◽  
BJ Kennedy ◽  
BO West
Keyword(s):  
Magnetic Properties ◽  
Electron Spin Resonance ◽  
Solid State ◽  
Electronic Structures ◽  
Magnetic Interactions ◽  
Antiferromagnetic Coupling ◽  
Temperature Dependent ◽  
Magnetic Susceptibilities ◽  
Spin Resonance ◽  
Oxygen Reactivity

Oxygen-active forms of [Co( salen )], derived from solvated forms such as [Co( salen )].C6H6, [Co( salen )]CHCl3 and Co( salen )(C5H5N), have long been known to bind dioxygen reversibly in the solid state. It has generally been accepted that the product of oxygenation is the diamagnetic peroxo -bridged species [Co( salen )]2O2. However, the present detailed study of temperature-dependent magnetic susceptibilities and of electron spin resonance spectra clearly shows that this is an oversimplification. The data show that the oxygenated species also contain the paramagnetic superoxo -like species [O2Co( salen )] as well as dimeric 'inactive' [Co( salen )]2 centres . Prolonged oxygenation produces also a second monomeric Co(salen) component although the e.s.r . spectra of both CoIIspecies are diminished in intensity relative to the [O2Co( salen )] signal. The magnetic properties of the oxygen-active Co( salen ) samples are compatible with ferromagnetically coupled pairs of Co( salen ) molecules, with further weak antiferromagnetic coupling between such sets of pairs. These magnetostructural features appear to be related to the solid-state oxygen reactivity. The solvated precursors also show weak magnetic interactions but different in detail to those in the desolvated materials.

Magnetic properties of PbO–Sb2O3–As2O3 glasses containing iron ions

2004 ◽  
Vol 284 ◽  
pp. 363-368 ◽  
Author(s):  
B.V. Raghavaiah ◽  
D. Krishna Rao ◽  
N. Veeraiah
Keyword(s):  
Magnetic Properties ◽  
Iron Ions

scholarly journals Quantitative mapping of magnetic properties at the nanoscale with bimodal AFM

Nanoscale ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 2026-2033
Author(s):  
Victor G. Gisbert ◽  
Carlos A. Amo ◽  
Miriam Jaafar ◽  
Agustina Asenjo ◽  
Ricardo Garcia
Keyword(s):  
Magnetic Properties ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Magnetic Interactions ◽  
Quantitative Mapping ◽  
Quantitative Accuracy

We demonstrate that a force microscope operated in a bimodal configuration enables the mapping of magnetic interactions with high quantitative accuracy and high-spatial resolution (∼30 nm).

Dielectric and Magnetic Properties of BaTiO3/NiFe2O4 Composites

2007 ◽  
Vol 336-338 ◽  
pp. 377-380 ◽  
Author(s):  
Jian Hong Shen ◽  
Ji Zhou ◽  
Xue Min Cui ◽  
Yue Hui Wang
Keyword(s):  
Dielectric Constant ◽  
Magnetic Properties ◽  
Solid State ◽  
Spinel Structure ◽  
Initial Permeability ◽  
Solid State Route ◽  
Permittivity And Permeability ◽  
Xrd Studies ◽  
Two Phases ◽  
Conventional Solid State Route

A series of ferrroelectric-ferromagnetic composites were synthesized from BaTiO3 and NiFe2O4 ferrite by conventional solid-state route. XRD studies indicated that the composites comprised of only two phases, BaTiO3 phase with perovskite structure and NiFe2O4 phase with spinel structure. Frequency dependence of permittivity and permeability were also measured. Experimental results showed that the dielectric constant and initial permeability of these composites could be tunable by varying the composition of composites. Thus, these composites can be used for multilayer chips EMI filters.

Magnetic Study on Divalent Ion Substituted Barium Hexaferrites

2021 ◽  
Vol 410 ◽  
pp. 714-719
Author(s):  
Denis Vinnik ◽  
Santhoshkumar Mahadevan ◽  
Puneet Sharma
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
Barium Hexaferrite ◽  
Anisotropy Field ◽  
Magnetic Interaction ◽  
Ceramic Method ◽  
Saturation Magnetisation ◽  
State Ceramic ◽  
Saturation Remanence ◽  
Substituted Barium Hexaferrite

Magnetic properties of Co, Ni and Zn substituted barium hexaferrite (BaM) samples prepared by solid state ceramic method were studied. Saturation magnetisation were found higher for Zn-substituted BaM, whereas, coercivity is higher for Co2+ and Ni2+ ion substituted samples. Anisotropy field for all substituted samples was calculated by the law of approaching saturation. Remanence, squareness and thermomagnetic plot suggest Zn2+ ions restricts the magnetic interaction of various sites in BaM.

scholarly journals Crystal chemistry and single-phase synthesis of Gd3+substituted Co–Zn ferrite nanoparticles for enhanced magnetic properties

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 25258-25267 ◽  
Author(s):  
R. A. Pawar ◽  
Sunil M. Patange ◽  
A. R. Shitre ◽  
S. K. Gore ◽  
S. S. Jadhav ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Crystal Chemistry ◽  
Single Phase ◽  
Secondary Phase ◽  
Ferrite Nanoparticles ◽  
Magnetic Interactions ◽  
Phase Synthesis ◽  
Zn Ferrite ◽  
Properties Of Materials

Rare earth (RE) ions are known to improve the magnetic interactions in spinel ferrites if they are accommodated in the lattice, whereas the formation of a secondary phase leads to the degradation of the magnetic properties of materials.

Sign in / Sign up

Export Citation Format

Share Document