FOUR SPIN EXCHANGE EXPLAINS SOME EXPERIMENTAL MAGNETIC PROPERTIES OF b.c.c. 3He

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-128-C6-129 ◽  
Author(s):  
M. Roger
Keyword(s):  
Magnetic Properties ◽  
Spin Exchange

Effects of cyclic four-spin exchange on the magnetic properties of theCuO2plane

1993 ◽  
Vol 47 (17) ◽  
pp. 11329-11336 ◽  
Author(s):  
Y. Honda ◽  
Y. Kuramoto ◽  
T. Watanabe
Keyword(s):  
Magnetic Properties ◽  
Spin Exchange

Tunable electronic structure and magnetic properties of Mn–NM (NM = B, C, N and S) co-doped monolayer WSe2

2019 ◽  
Vol 33 (35) ◽  
pp. 1950446
Author(s):  
Wenlong Lai ◽  
Lixin Wang ◽  
Yukai An
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Magnetic Materials ◽  
Spin Polarization ◽  
Density Functional ◽  
Chemical Potential ◽  
Spin Exchange ◽  
Potential Range ◽  
Mn Doped ◽  
Co Doped

Searching two-dimensional (2D) magnetic materials with high spin polarization is important for the development and application of next-generation spintronic devices. Here, based on spin-polarized density functional theory calculations, the stability, electronic structure and magnetic properties of Mn-doped and Mn–NM (NM = B, C, N and S) co-doped monolayer WSe2 are investigated in detail. The results indicate that the Mn–S co-doped MoSe2 configuration has the lowest formation energy in the whole chemical potential range and easily spontaneously forms under thermodynamic equilibrium conditions. Obviously, the Mn-doped WSe2 configuration exhibits magnetic half-metallicity characters with a completely spin polarization at the Femi level [Formula: see text], which can be attributed to that the electrons partially occupy the bonding states consisting of Mn [Formula: see text] states at the [Formula: see text]. For the Mn–C and Mn–S co-doped configurations, the Mn [Formula: see text] and [Formula: see text] orbitals strongly hybridize with the C or S spin-up [Formula: see text] orbital at the [Formula: see text], which induces strong spin exchange splitting and eventually gives rise to the magnetic semiconductor character. However, the Mn–B and Mn–N co-doped configurations exhibit completely symmetrical spin-up and spin-down channel of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] states due to the effective charge compensation between Mn and B or N atoms. These studies provide a new class of 2D magnetic materials for future spintronics devices.

Optical And Magnetic Properties Of Rigid Rod Conjugated Molecules

1993 ◽  
Vol 328 ◽  
Author(s):  
P. Wautelet ◽  
J. Le Moigne ◽  
P. Turek
Keyword(s):  
Magnetic Properties ◽  
Optical Properties ◽  
Solid State ◽  
Spin Exchange ◽  
Magnetic Interaction ◽  
Conjugated Molecules ◽  
Organic Magnets ◽  
Rigid Rod ◽  
Optical And Magnetic Properties ◽  
Solid State Materials

ABSTRACTA series of new stable fiinctionalised aryl ethynyl compounds bearing nitronyl-nitroxy and galvinoxyl radicals were synthesised as potential organic magnets with optical properties. Our goal is to construct biradicals in linear or broken rod molecules with the aim of probing i) the efficiency of the conjugation for the intramolecular spin exchange, and / or ii) the inter-Molecular Magnetic interaction between the neighboring radicals in the solid state Materials.We focused our attention on the preparation of phenoxy, and galvinoxyl biradicals of the conjugated phenyl and thienyl diethynyl Moieties. The synthesis of these new components will be presented. Their optical and magnetic properties will be discussed both in solution and in the solid state.

Structures and Magnetic Properties of Dinuclear Iron(III) Complexes

1994 ◽  
Vol 49 (3) ◽  
pp. 365-369 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalcin Elerman ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Structures ◽  
Exchange Coupling ◽  
Spin Exchange ◽  
Coupling Constants ◽  
Inversion Center ◽  
Monoclinic System ◽  
Dinuclear Iron ◽  
Binuclear Unit

AbstractThe compounds [FeL1(MeOH)Cl]2 (1), [FeL2Cl]2 (2) and [FeL3Cl]2 (3), with L1 for N-2-hydroxy-4-chlorophenylsalicylaldimin, L2 for N-2-hydroxyphenyl-3-hydroxy-2-naphthaldimin, and L3 for N-2-hydroxy-4-chlorophenyl-3-hydroxy-2-naphthaldimin, have been synthesized. 1 crystallizes in the monoclinic system, space group P21/c. The lattice parameters are a = 7.347(1), b = 21.390(1), c = 9.555(2) Å, β = 104.92(1)° with Z = 2. The crystal structures of 2 and 3 were reported previously. In all structures, two identical [FeL] fragments, related by an inversion center, are connected by two bridging oxygen atoms to form a binuclear unit in the supported condition. Magnetic susceptibility measurements in the range 4.2 < T < 286.5 K re­vealed the diiron (III) centers of 1, 2, and 3 to be weakly antiferromagnetically coupled with spin exchange coupling constants J1 = -7.7(1) cm-1, J2 = -6.5(1) cm-1, and J3 = -10.9(1) cm-1, respectively.

scholarly journals Effect of Yttrium Addition on Structure and Magnetic Properties of Co60Fe20Y20 Thin Films

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6001
Author(s):  
Wen-Jen Liu ◽  
Yung-Huang Chang ◽  
Yuan-Tsung Chen ◽  
Ding-Yang Tsai ◽  
Pei-Xin Lu ◽  
...  
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Surface Energy ◽  
Spin Exchange ◽  
Low Frequency ◽  
Alternate Current ◽  
Thickness Effect ◽  
Annealing Temperatures ◽  
Yttrium Addition ◽  
Strong Adhesion

In this paper, a Co60Fe20Y20 film was sputtered onto Si (100) substrates with thicknesses ranging from 10 to 50 nm under four conditions to investigate the structure, magnetic properties, and surface energy. Under four conditions, the crystal structure of the CoFeY films was found to be amorphous by an X-ray diffraction analyzer (XRD), suggesting that yttrium (Y) added into CoFe films and can be refined in grain size and insufficient annealing temperatures do not induce enough thermal driving force to support grain growth. The saturation magnetization (MS) and low-frequency alternate-current magnetic susceptibility (χac) increased with the increase of the thicknesses and annealing temperatures, indicating the thickness effect and Y can be refined grain size and improved ferromagnetic spin exchange coupling. The highest Ms and χac values of the Co60Fe20Y20 films were 883 emu/cm3 and 0.26 when the annealed temperature was 300 °C and the thickness was 50 nm. The optimal resonance frequency (fres) was 50 Hz with the maximum χac value, indicating it could be used at a low frequency range. Moreover, the surface energy increased with the increase of the thickness and annealing temperature. The maximum surface energy of the annealed 300 °C film was 30.02 mJ/mm2 at 50 nm. Based on the magnetic and surface energy results, the optimal thickness was 50 nm annealed at 300 °C, which has the highest Ms, χac, and a strong adhesion, which can be as a free or pinned layer that could be combined with the magnetic tunneling layer and applied in magnetic fields.

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