Diazopyridine–Ni(ii) complexes exhibiting intra-chain ferromagnetic interaction after irradiation: formation of magnetic gel

2015 ◽  
Vol 2 (10) ◽  
pp. 917-926 ◽  
Author(s):  
Koya Mori ◽  
Rumi Eguchi ◽  
Satoru Karasawa ◽  
Noboru Koga
Keyword(s):  
Correlation Length ◽  
Magnetic Behavior ◽  
Ferromagnetic Interaction ◽  
Ferromagnetic Chain

The gel of a diazopyridine–Ni(ii) complex in EtOH–20% CH2Cl2 solution showed the magnetic behavior of a ferromagnetic chain with the correlation length of 5–6 units after irradiation, suggesting the formation of magnetic gel.

Organic ferromagnetic chain in the yttrium diphthalocyanine [YPc2]·CH2Cl2: X-ray structure and magnetic behavior

1991 ◽  
Vol 175 (4) ◽  
pp. 337-348 ◽  
Author(s):  
J.L. Paillaud ◽  
M. Drillon ◽  
A. Decian ◽  
J. Fischer ◽  
R. Weiss ◽  
...  
Keyword(s):  
Magnetic Behavior ◽  
X Ray ◽  
Ferromagnetic Chain

scholarly journals Two-Dimensional Nitronyl Nitroxide–Cu Networks Based on Multi-Dentate Nitronyl Nitroxides: Structures and Magnetic Properties

2021 ◽  
Vol 7 (5) ◽  
pp. 73
Author(s):  
Hongdao Li ◽  
Jiao Lu ◽  
Jing Xie ◽  
Pei Jing ◽  
Licun Li
Keyword(s):  
Magnetic Properties ◽  
Pyridine Ring ◽  
Layer Structure ◽  
Magnetic Behavior ◽  
Antiferromagnetic Coupling ◽  
Two Dimensional ◽  
Nitronyl Nitroxide ◽  
Ferromagnetic Interaction ◽  
Tetradentate Ligands ◽  
Nitronyl Nitroxides

Two multi-dentate nitronyl nitroxide radicals, namely, bisNITPhPy ([5-(4-pyridyl)-1,3-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)]benzene) and NIT-3Py-5-4Py (2-{3-[5-(4-pyridyl)]pyridyl}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), were assembled with CuII ions to obtain two-dimensional heterospin 2p–3d coordination polymers [Cu7(hfac)14(bisNITPhPy)2]n (1) and [Cu2(hfac)4(NIT-3Py-5-4Py)]n (2) (hfac: hexafluoroacetylacetonate). In both compounds, the bisNITPhPy and NIT-3Py-5-3Py radicals acted as pentadentate and tetradentate ligands, respectively, to connect with CuII ions, generating a 2D layer structure. The analysis of the magnetic behavior indicated that strong antiferromagnetic coupling and ferromagnetic interaction (J = 17.1 cm−1) coexisted in 1. For 2, there were ferromagnetic couplings between the CuII ion and NO group, as well as the CuII ion and radical via the pyridine ring with J1 = 32.8 and J2 = 2.2 cm−1, respectively.

Sulfur-centred polyoxoniobate-based 3D organic–inorganic hybrid compound and its magnetic behavior

2016 ◽  
Vol 52 (72) ◽  
pp. 10846-10849 ◽  
Author(s):  
Ju-Fang Hu ◽  
Tian Han ◽  
Ying-Nan Chi ◽  
Zheng-Guo Lin ◽  
Yan-Qing Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Magnetic Behavior ◽  
Cobalt Complexes ◽  
Hybrid Compound ◽  
Ferromagnetic Interaction ◽  
Inorganic Hybrid ◽  
Weak Ferromagnetic

A novel sulfur-centered polyanion {SNb8V9.25O45.25} was connected by cobalt-complexes into a 3D hybrid compound showing weak ferromagnetic interaction at low temperature.

scholarly journals A Variety of Magnetism in CuMpt6 (M=3d Transition Metals) Ternary Alloys

1970 ◽  
Vol 32 (2) ◽  
Author(s):  
AK Das ◽  
AKM Zakaria ◽  
I Kamal
Keyword(s):  
Spin Glass ◽  
Quantum Interference ◽  
Magnetic Moments ◽  
Magnetic Behavior ◽  
Ternary Alloys ◽  
Ferromagnetic Behavior ◽  
Ferromagnetic Interaction ◽  
Glass Type ◽  
Academy Of Sciences ◽  
Curie Temperatures

The magnetic properties of polycrystalline CuMPt6 (M= Ti, V, Cr, Mn, Fe, Co and Ni) ternary alloys were studied by Superconducting Quantum Interference Device (SQUID) over the temperature range 4-300 K. Magnetization measurements revealed that the compounds containing M=Ti, V and Ni are paramagnetic. A spin glass type magnetic behavior appeared in the compounds with M= Cr and Mn in their annealed state and the corresponding temperatures for freezing the magnetic moments were Tg= 15 and 40 K, respectively. Positive values of the paramagnetic Curie temperature (Q) indicated that the ferromagnetic interaction is dominant in these spin-glass compounds. The compounds with M= Fe and Co showed ferromagnetic behavior having Curie temperatures (TC) = 230, and 190 K, respectively. Hysteresis study showed that the alloy with M=Co was magnetically softer than that with M=Fe. Keywords: CuMPt6 ternary alloys, Magnetic behavior, Effective magnetic moments (Peff), Spin glass type. doi: 10.3329/jbas.v32i2.2428 Journal of Bangladesh Academy of Sciences Vol.32(2) 2008 218-225

Lorentz electron microscopy of magnetic domains in rapidly solidified and annealed Pt-Co-B alloys

1991 ◽  
Vol 49 ◽  
pp. 784-785
Author(s):  
N. Qiu ◽  
J. E. Wittig
Keyword(s):  
Rapid Solidification ◽  
Ion Beam ◽  
Magnetic Behavior ◽  
High Coercivity ◽  
Magnetic Domains ◽  
Beam Angle ◽  
Tem Analysis ◽  
Intrinsic Coercivity ◽  
Hard Magnets ◽  
Rapidly Solidified

PtCo hard magnets have specialized applications owing to their relatively high coercivity combined with corrosion resistance and ductility. Increased intrinsic coercivity has been recently obtained by rapid solidification processing of PtCo alloys containing boron. After rapid solidification by double anvil splat quenching and subsequent annealing for 30 minutes at 650°C, an alloy with composition Pt42Co45B13 (at.%) exhibited intrinsic coercivity up to 14kOe. This represents a significant improvement compared to the average coercivities in conventional binary PtCo alloys of 5 to 8 kOe.Rapidly solidified specimens of Pt42Co45B13 (at.%) were annealed at 650°C and 800°C for 30 minutes. The magnetic behavior was characterized by measuring the coercive force (Hc). Samples for TEM analysis were mechanically thinned to 100 μm, dimpled to about 30 nm, and ion milled to electron transparency in a Gatan Duomill at 5 kV and 1 mA gun current. The incident ion beam angle was set at 15° and the samples were liquid nitrogen cooled during milling. These samples were analyzed with a Philips CM20T TEM/STEM operated at 200 kV.

STRANGE MAGNETIC BEHAVIOR IN THE LITHIUM-METHYLAMINE SYSTEM

1980 ◽  
Vol 41 (C8) ◽  
pp. C8-45-C8-48
Author(s):  
A. Stacy ◽  
D. C. Johnson ◽  
M. J. Sienko
Keyword(s):  
Magnetic Behavior

Magnetic Properties of xCeO2•(50 − x) PbO•50B2O3 Glasses and Glass Ceramics

2017 ◽  
Vol 13 (1) ◽  
pp. 4486-4494 ◽  
Author(s):  
G.El Damrawi ◽  
F. Gharghar
Keyword(s):  
Magnetic Properties ◽  
Large Scale ◽  
Glass Ceramics ◽  
Magnetic Behavior ◽  
Crystal Formation ◽  
Dual Roles ◽  
Effective Agent ◽  
Ordered Structures ◽  
Essential Change

Cerium oxide in borate glasses of composition xCeO2·(50 − x)PbO·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior.  The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation. 

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