Magnetic Anisotropy of Cerium Endohedral Metallofullerene

MRS Proceedings â—½  
2001 â—½  
Vol 706 â—½  
Author(s):  
Masayasu Inakuma â—½  
Toshiaki Enoki â—½  
Haruhito Kato â—½  
Hisanori Shinohara
Keyword(s):  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Low Temperature â—½  
Magnetic Anisotropy â—½  
Rotational Motion â—½  
Applied Field â—½  
Magnetic Interaction â—½  
Magnetization Measurement â—½  
Antiferromagnetic Interaction â—½  
Antiferromagnetic Coupling

AbstractThe magnetic properties of Ce@C82 have been studied. The magnetic anisotropy of Ce@C82 was analyzed taking account of the crystal field of the interior C82 cage acting on Ce3+ ion. Results showed that the reduction of the susceptibility at low temperature was caused due to the antiferromagnetic coupling between Ce3+ ion and C82 cage. The magnetization measurement at several temperatures also supported the antiferromagnetic interaction at low temperature. The magnetic susceptibility larger than the calculated one was measured at higher temperatures due to the magnetic interaction between the metallofullerenes and between the particles in the crystal. The magnetization of some frozen Ce@C82 solutions was found to depend on the applied field magnitude. The dependence suggested that the magnetic anisotropy of Ce ion induced a torque to restrict the rotational motion of Ce@C82 by the field.

Dynamics and magnetic properties of NO molecules encapsulated in open-cage fullerene derivatives evidenced by low temperature heat capacity

10.1039/d1cp00482d â—½  
2021 â—½  
Author(s):  
Yoji Horii â—½  
Hal Suzuki â—½  
Yuji Miyazaki â—½  
Motohiro Nakano â—½  
Shota Hasegawa â—½  
...  
Keyword(s):  
Heat Capacity â—½  
Magnetic Properties â—½  
Low Temperature â—½  
Magnetic Anisotropy â—½  
Fullerene Derivatives â—½  
Molecular Cages â—½  
Temperature Heat â—½  
Low Temperature Heat Capacity

Heat capacity analyses revealed dynamics and magnetic anisotropy of NO molecules confined in molecular cages.

Struktur und magnetische Eigenschaften von [CuII(2-thiooxamat)2] · 1,6H2O / Structure and Magnetic Properties of [CuII(2-thiooxamat)2] · 1,6 H2O

1990 â—½  
Vol 45 (7) â—½  
pp. 1000-1004 â—½  
Author(s):  
Ralf Krause â—½  
Rainer Mattes
Keyword(s):  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Antiferromagnetic Coupling â—½  
Crystal Data â—½  
Axial Coordination â—½  
Coordination Sites â—½  
Chelate Rings

The reaction of CuSO4·5 H2O with potassium 2-thiooxamate, K[NH2C(S)CO2], yields [Cu(2-thiooxamate)2]·1.6 H2O. Crystal data: a = 1501.6(8), b = 1650(1), c = 375.4(2) pm, β = 90.65(5)°, Ζ = 4. The structure was refined with 2213 reflections to R = 0.044. Copper(II) is chelated by two thiooxamate ligands, which act as O- and S-donors forming five-membered chelate rings. This cis-planar [Cu(2-thiooxamate)2] molecules are stacked. The axial coordination sites at copper(II) interact within the stacks with O- and S-donor atoms of neighbouring units. Above 60 K the magnetic susceptibility follows the Curie-Weiss law with antiferromagnetic coupling.

ChemInform Abstract: LOW TEMPERATURE MAGNETIC PROPERTIES AND ANTIFERROMAGNETIC INTERACTIONS OF THE MAGNETIC SUSCEPTIBILITY CALIBRANT HGCO(NCS)4

1979 â—½  
Vol 10 (14) â—½  
Author(s):  
C. J. O'CONNOR â—½  
E. SINN â—½  
E. J. CUKAUSKAS â—½  
B. S. JUN. DEAVER
Keyword(s):  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Low Temperature

A low-temperature study of the magnetic properties of the molecular cations O2+, Br2+, and I2+

10.1139/v89-302 â—½  
1989 â—½  
Vol 67 (11) â—½  
pp. 1942-1948 â—½  
Author(s):  
M. S. R. Cader â—½  
R. C. Thompson â—½  
F. Aubke
Keyword(s):  
Magnetic Properties â—½  
Low Temperature â—½  
Magnetic Moment â—½  
Photoelectron Spectroscopy â—½  
Theoretical Models â—½  
Antiferromagnetic Coupling â—½  
Paramagnetic Species â—½  
Magnetic Studies â—½  
Suggested Keywords â—½  
Molecular Cations

Magnetic susceptibility measurements to 4.2 K are reported forO2+[AsF6]−, Br2+[Sb3F16]−, and I2+[Sb2F11]−. The data are interpreted utilizing previous results from photoelectron spectroscopy, known crystal structures, magnetic studies on the superoxide ion and the ozonide ion, and in the case of O2+[AsF6]−, previous ESR studies. The magnetic properties of the three materials are quite different. Br2+[Sb3F16]− obeys Curie–Weiss law between 80 and 4 K: Cm = 0.49 ± 0.01 cm3 mol−1 K and 9 = −0.74 ± 0.01 K (with TIP = 120 × 10−6 cm3 mol−1). The magnetic moment decreases slightly from 2.04 μB at room temperature to 1.93 μB at 4 K. I2+[Sb2F11]− exhibits relatively strong antiferromagnetic coupling with a maximum in χM observed at −54 K. The magnetic moment (corrected for a TIP contribution of 68 × 10−6 cm3 mol−1) decreases from 1.92 μB at 124 K to 0.41 μB at 4 K. Experimental susceptibilities for this compound over the range 300–4 K have been compared to values calculated using three different theoretical models for extended chains of antiferromagnetically coupled paramagnetic species. O2+[AsF6]− exhibits Curie–Weiss behaviour over the range 60–2 K (Cm = 0.34 ± 0.01 cm3 mol−1 K, θ = −1.90 ± 0.01 K). The magnetic moment, uncorrected for TIP, varies from 1.63 μB at 80 K to 1.17 μB at 2 K, and the presence of weak antiferromagnetic coupling in this material is suggested. Keywords: magnetic susceptibilities, dihalogen cations, dioxygenyl cation, low temperature behaviour.

Synthesis, Crystal Structure, and Spectroscopic and Magnetic Properties of a Dinuclear Iron(III) Complex Asymmetrically Bridged by a Phenoxo and a Methoxo Group

2005 â—½  
Vol 60 (9) â—½  
pp. 940-944 â—½  
Author(s):  
C. T. Zeyrek â—½  
A. Elmali â—½  
Y. Elerman
Keyword(s):  
Crystal Structure â—½  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Structural Parameters â—½  
Hamiltonian Operator â—½  
Antiferromagnetic Coupling â—½  
Iron Ions â—½  
Spin Hamiltonian â—½  
Dinuclear Iron â—½  
Super Exchange Interaction

A new dinuclear iron(III) derivative Fe2L(OCH3)Cl2 (L = 1,3-bis[N-(5-chloro-2-hydroxybenzylidene)- 2-aminoethyl]-2-(5-chloro-2-hydroxyphenyl)imidazolidine) has been synthesized, it crystal structure determined and magnetically characterized. The two iron(III) ions are asymmetrically bridged by a phenoxo and a methoxo group and separated by 3.150(2)Å . The magnetic susceptibility of the complex was measured over the range 5 - 349.3 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator , indicating very weak antiferromagnetic coupling between the iron ions with J = −11.3 cm−1. The magnetic and structural parameters of the compound and the nature of the magnetic super-exchange interaction are discussed and compared with data of similar dinuclear iron(III) complexes.

scholarly journals Magnetic transformation in Ni-Mn-In Heusler alloy

Nukleonika â—½  
2015 â—½  
Vol 60 (3) â—½  
pp. 435-438
Author(s):  
Marian Kuzma â—½  
Wojciech Maziarz â—½  
Ireneusz Stefaniuk
Keyword(s):  
Magnetic Properties â—½  
Low Temperature â—½  
Ferromagnetic Resonance â—½  
Temperature Region â—½  
Heusler Alloy â—½  
Antiferromagnetic Interaction â—½  
Magnetic Transformation â—½  
Crystal Transformation â—½  
Crystal State â—½  
Martensitic State

Abstract Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.

MAGNETIC ANISOTROPY OF CoFeB AMORPHOUS NANOTUBES PREPARED BY ELECTROLESS PLATING IN MAGNETIC FIELD

2013 â—½  
Vol 27 (19) â—½  
pp. 1341006 â—½  
Author(s):  
Z. LIU â—½  
W. L. LI â—½  
W. D. FEI
Keyword(s):  
Magnetic Field â—½  
Magnetic Properties â—½  
Magnetic Anisotropy â—½  
Electroless Plating â—½  
Applied Field â—½  
Anodized Aluminum â—½  
Anodized Aluminum Oxide â—½  
Squareness Ratio â—½  
Out Of Plane â—½  
Structural And Magnetic Properties

CoFeB nanotubes were fabricated by electroless plating in magnetic field using anodized aluminum oxide template, and the structural and magnetic properties of CoFeB nanotubes were investigated. It is found that some nano-scale particles form on the wall of nanotubes. Both coercivity ratio and squareness ratio of out-of-plane to in-plane are significantly changed by the applied magnetic field during electroless plating, which indicates that directional ordering in amorphous CoFeB nanotubes are achieved during electroless plating under magnetic field. The results show that the applied field impacts the magnetic anisotropy of amorphous nanotubes. The anisotropy is stronger with the magnitude of applied field increasing.

Structural and Magnetic Properties of the Coordination Polymer Mn(dca)2(H2O)2·2Me4pyz, dca = Dicyanamide (N(CN)2-), Me4pyz = Tetramethylpyrazine

10.1071/ch02065 â—½  
2002 â—½  
Vol 55 (5) â—½  
pp. 311 â—½  
Author(s):  
A. M. Kutasi â—½  
A. R. Harris â—½  
S. R. Batten â—½  
B. Moubaraki â—½  
K. S. Murray
Keyword(s):  
Hydrogen Bond â—½  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Coordination Polymer â—½  
Polymer Chains â—½  
Antiferromagnetic Coupling â—½  
One Dimensional â—½  
Polymeric Chains â—½  
Structural And Magnetic Properties â—½  
Water Ligands

The structure of Mn(dca)2(H2O)2�2Me4pyz (dca = dicyanamide, N(CN)2-; Me4pyz = tetramethylpyrazine) contains one-dimensional polymeric chains of Mn(dca)2(H2O)2. The Me4pyz molecules hydrogen-bond to the water ligands, and form ���Me4pyz���H2O���Me4pyz���H2O��� chains which flank either side of the coordination polymer chains. Magnetic susceptibility studies show that very weak intra-chain antiferromagnetic-coupling occurs.

MAGNETIC PROPERTIES OF R2In (R=Gd, Tb, Er)

1993 â—½  
Vol 07 (01n03) â—½  
pp. 818-821 â—½  
Author(s):  
D. RAVOT â—½  
O. GOROCHOV â—½  
T. ROISNEL â—½  
G. ANDRE â—½  
F. BOUREE-VIGNERON â—½  
...  
Keyword(s):  
Crystal Structure â—½  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Rare Earth â—½  
Low Temperature â—½  
Neutron Diffraction â—½  
Antiferromagnetic State â—½  
Powder Neutron Diffraction â—½  
Magnetic Transport â—½  
The Rare Earth

For all the Rare-Earth (R) the R2In form in the same crystal structure (P63/mmc). These compounds show a great variety of magnetic behaviors. When the temperature decreases, the magnetic susceptibility of Er2InTb2In and Gd2In increases, passes through a maximum then decreases. For Gd2In this behavior was associated with change from a paramagnetic to a ferromagnetic then to an antiferromagnetic state. We have performed magnetic, transport (Tb, Er), Mössbauer spectroscopy (Er) and powder neutron diffraction experiments (Gd, Tb, Er) on these compounds. Unlike Gd2In the resistivity of Tb2In and Er2In does not reveal any anomaly at the temperature where the susceptibility begins to decrease and the Tb2In and Er2In magnetizations show the same behavior at all temperatures in the ordered region. Neutron diffraction experiments reveal ferromagnetic and antiferromagnetic structures at low temperature.

Exchange Interaction in a Dinuclear Iron(III) Complex of a Heptadentate Schiff Base: Synthesis, Crystal Structure and Magnetic Properties

2005 â—½  
Vol 60 (7) â—½  
pp. 727-731 â—½  
Author(s):  
C. T. Zeyrek â—½  
A. Elmali â—½  
Y. Elerman
Keyword(s):  
Crystal Structure â—½  
Magnetic Properties â—½  
Magnetic Susceptibility â—½  
Schiff Base â—½  
Exchange Interaction â—½  
Hamiltonian Operator â—½  
Antiferromagnetic Coupling â—½  
Iron Ions â—½  
Spin Hamiltonian â—½  
Dinuclear Iron

Synthesis, crystallographic characterization and magnetic properties of the new dinuclear iron(III) complex Fe2L(OCH3)Cl2 (L=1,3-bis[N-(3,5-dichloro-2-hydroxybenzylidene)-2-aminoethyl]-2-(3,5- dichlo ro-2-hydroxyphenyl)imidazolidine) are reported. The structure consists of dinuclear units. The two iron(III) atoms are asymmetrically bridged by a phenoxo and a methoxo group. The iron(III) centers are separated by 3.133(2) Å . The Magnetic susceptibility of the complex was measured over the range 5 - 298 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator H = −JS⃗1.S⃗2. Magnetic susceptibility measurements indicate very weak antiferromagnetic coupling between the iron ions with J = −10.8 cm−1 and g = 2.0.

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