Strong antiferromagnetic coupling of the cobalt(ii)–semiquinone radical in a dinuclear complex with 2,2′-bipyrimidine ligands

2020 ◽  
Vol 44 (20) ◽  
pp. 8471-8476
Author(s):  
Jin-Hua Wang ◽  
Jing-Wei Dai ◽  
Zhao-Yang Li ◽  
Masahiro Yamashita
Keyword(s):  
Exchange Coupling ◽  
Dinuclear Complex ◽  
Antiferromagnetic Coupling ◽  
Semiquinone Radical ◽  
Antiferromagnetic Exchange ◽  
Radical Complex ◽  
Semiquinone Radicals

A new dinuclear cobalt(ii)–semiquinone radical complex was synthesised and displayed strong antiferromagnetic exchange coupling, having −90.25 cm−1 of a J value, between the cobalt(ii) centres and semiquinone radicals.

Tetranuclear copper(ii) cubane complexes derived from self-assembled 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil: structures, non-covalent interactions and magnetic property

2021 ◽  
Vol 45 (5) ◽  
pp. 2742-2753
Author(s):  
Nishithendu Bikash Nandi ◽  
Atanu Purkayastha ◽  
Shaktibrata Roy ◽  
Julia Kłak ◽  
Rakesh Ganguly ◽  
...  
Keyword(s):  
Magnetic Property ◽  
Exchange Coupling ◽  
Antiferromagnetic Exchange ◽  
Non Covalent Interactions ◽  
Cubane Cluster ◽  
Self Assembled ◽  
Covalent Interactions

A new doubly opened 4 + 2 Cu4O4 cubane cluster exhibits strong antiferromagnetic exchange coupling with J1 = −110.1 cm−1, and J2 = −27.1 cm−1.

scholarly journals Transferrable property relationships between magnetic exchange coupling and molecular conductance

2020 ◽  
Vol 11 (42) ◽  
pp. 11425-11434
Author(s):  
Martin L. Kirk ◽  
Ranjana Dangi ◽  
Diana Habel-Rodriguez ◽  
Jing Yang ◽  
David A. Shultz ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Semiquinone Radical ◽  
Magnetic Exchange ◽  
Magnetic Exchange Coupling ◽  
Coupling Parameters ◽  
Molecular Conductance

Calculated conductance through Aun–S–Bridge–S–Aun constructs are compared to experimental magnetic exchange coupling parameters in TpCum,MeZn(SQ–Bridge–NN) complexes, where SQ = semiquinone radical and NN = nitronylnitroxide radical.

Critical curves of thin ferromagnetic films with antiferromagnetic exchange coupling

1971 ◽  
Vol 34 (4) ◽  
pp. 223-224 ◽  
Author(s):  
B. Kuhlow ◽  
M. Lambeck ◽  
H. Schroeder-Fürst ◽  
J. Wortmann
Keyword(s):  
Exchange Coupling ◽  
Antiferromagnetic Exchange ◽  
Ferromagnetic Films ◽  
Critical Curves

Antiferromagnetic exchange coupling measurements on single Co clusters

2008 ◽  
Vol 78 (14) ◽  
Author(s):  
Céline Portemont ◽  
Robert Morel ◽  
Wolfgang Wernsdorfer ◽  
Dominique Mailly ◽  
Ariel Brenac ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Antiferromagnetic Exchange

Ferro- and antiferromagnetic exchange coupling in magnetooptical bilayers with planar and perpendicular anisotropy

1995 ◽  
Vol 31 (6) ◽  
pp. 3274-3276 ◽  
Author(s):  
R. Sbiaa ◽  
H. Le Gall ◽  
Y. Braik ◽  
J.M. Desvignes ◽  
S. Yurchenko
Keyword(s):  
Exchange Coupling ◽  
Antiferromagnetic Exchange ◽  
Perpendicular Anisotropy

scholarly journals PROXIMITY EFFECTS AND CURIE TEMPERATURE ENHANCEMENT IN Co/EuS AND Fe/EuS MULTILAYERS

SPIN ◽  
2012 ◽  
Vol 02 (04) ◽  
pp. 1250016 ◽  
Author(s):  
B. LEWITZ ◽  
A. STRAUB ◽  
V. KAPAKLIS ◽  
P. POULOPOULOS ◽  
A. DELIMITIS ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Exchange Coupling ◽  
Proximity Effects ◽  
Antiferromagnetic Exchange ◽  
Coupling Constant ◽  
Polycrystalline Structure ◽  
Individual Layer ◽  
Temperature Enhancement ◽  
The Individual ◽  
Almost Continuous

Two identical Co/EuS and Fe/EuS multilayers of six periods each and with individual layers of about 4 nm thick are grown by e-beam evaporation under ultrahigh vacuum conditions. The films show polycrystalline structure with a grain size limited by the individual layer thickness. Both multilayers consist of almost continuous layers with some roughness. The surface peak-to-peak roughness is about 4–5 nm. Magnetization measurements and calculations of the loops based on a Stoner–Wohlfarth-like model allow us to determine the direct antiferromagnetic exchange coupling constant between the 3d metal and EuS at 5 K. Both samples show strong enhancement of the Curie temperature of EuS up to at least 50 K with a EuS magnetization tail, which persists up to about 100 K. The J = 7/2 character of the EuS layers is shown to be responsible for the large Curie temperature enhancement.

Observation of an Exponential FeSi Spacer Thickness Dependence of the Antiferromagnetic Exchange Coupling in Fe/Si-Based Multilayers

1997 ◽  
Vol 475 ◽  
Author(s):  
J.T. Kohlhepp ◽  
J.J. De Vries ◽  
F.J.A. Den Broeder ◽  
R. Coehoorn ◽  
R.M. Jungblut ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Room Temperature ◽  
Decay Length ◽  
Antiferromagnetic Exchange ◽  
Interlayer Exchange Coupling ◽  
Magnetic Layers ◽  
Magnetic Analysis ◽  
Spacer Thickness ◽  
Interlayer Exchange ◽  
B2 Structure

ABSTRACTThe magnetic interlayer exchange coupling in Fe/Si-based thin film structures employing sputtered multilayers with variations of Si-alloyed Fe for the magnetic layers and Fe-alloyed Si spacers, as well as wedge-shaped MBE-grown Fe/Si/Fe sandwich samples has been systematically studied. From structural and magnetic analysis it is concluded that ultrathin Si and FexSi100-x (x < 50) spacer layers transform into a crystalline iron suicide with a composition close to Fe50Si50. The exchange coupling mediated by this metallic suicide is antiferromagnetic and depends on the spacer thickness in an exponential, i.e. non-oscillatory, manner with a universial characteristic decay length of 3–4 Å at room temperature. This observation can be qualitatively explained within the framework of a recent coupling theory on the premise that the FeSi interlayer has the metastable CsCl(B2)-structure.

Studies of Exchange Coupling in Fe/Cu/Fe(001) “Loose Spin” Structures

1995 ◽  
Vol 384 ◽  
Author(s):  
M. Kowalewski ◽  
B. Heinrich ◽  
K. Totland ◽  
J.F. Cochran ◽  
S. Govorkov ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Interlayer Coupling ◽  
Antiferromagnetic Coupling ◽  
Concentration Limit ◽  
Interlayer Exchange Coupling ◽  
High Concentration ◽  
Significant Difference ◽  
Valence Electrons ◽  
Interlayer Exchange

ABSTRACTThe interlayer exchange coupling has been studied in two trilayer structures:(a) 5.7Fe/5Cu/1FecCu1-c/5Cu/10Fe(001), where c=0.0, 0.1, 0.2, 0.45 0.60(b) 5.7Fe/5Cu/1CrcCu1-c/5Cu/10Fe(001), where c=0.1, 0.45, 0.8 and 1.0.The intention of these studies was to identify the role of Fe and Cr atoms in the alloyed FecCu1-c and CrcCu1-c layers on the direct interlayer coupling which is facilitated by the Cu valence electrons. FMR, BLS and MOKE studies were used to determine the interlayer exchange coupling. Mossbauer spectroscopy was used to identify the magnetic state of the Fe atoms in the alloyed layer. The results showed that the presence of foreign atoms inside the Cu spacer significantly decreased the bilinear antiferromagnetic coupling between the Fe layers. In the low concentration limit the Fe and Cr atoms behaved in a similar manner. A significant difference was found in the high concentration limit where the Fe atoms start to be partially magnetically ordered.

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