Tailor-Made Strong Exchange Magnetic Coupling through Very Long Bridging Ligands:  Theoretical Predictions

2003 ◽  
Vol 42 (16) ◽  
pp. 4881-4884 ◽  
Author(s):  
Eliseo Ruiz ◽  
Antonio Rodríguez-Fortea ◽  
Santiago Alvarez
Keyword(s):  
Magnetic Coupling ◽  
Bridging Ligands ◽  
Theoretical Predictions ◽  
Strong Exchange

Structure and Magnetism of Dinuclear Copper(II) Metallacyclophanes with Oligoacenebis(oxamate) Bridging Ligands:  Theoretical Predictions on Wirelike Magnetic Coupling

2008 ◽  
Vol 130 (2) ◽  
pp. 576-585 ◽  
Author(s):  
Emilio Pardo ◽  
Rosa Carrasco ◽  
Rafael Ruiz-García ◽  
Miguel Julve ◽  
Francesc Lloret ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Bridging Ligands ◽  
Dinuclear Copper ◽  
Theoretical Predictions

scholarly journals Record high magnetic exchange and magnetization blockade in Ln2@C79N (Ln = Gd(iii) and Dy(iii)) molecules: a theoretical perspective

2015 ◽  
Vol 51 (100) ◽  
pp. 17732-17735 ◽  
Author(s):  
Mukesh Kumar Singh ◽  
Neeraj Yadav ◽  
Gopalan Rajaraman
Keyword(s):  
Theoretical Perspective ◽  
Magnetic Coupling ◽  
Magnetic Exchange ◽  
Great Chance ◽  
Strong Exchange ◽  
Paramagnetic Centres

Ln2@C79N EMFs are found to attain the largest magnetic coupling reported to date between Ln-radical paramagnetic centres. The obtained Ucal values are very large, and strong exchange likely to quench the QTM effects offers a great chance to obtain high blocking temperatures.

Hard versus soft: zero-field dinuclear Dy(iii) oxygen bridged SMM and theoretical predictions of the sulfur and selenium analogues

2019 ◽  
Vol 48 (9) ◽  
pp. 2872-2876 ◽  
Author(s):  
Kuduva R. Vignesh ◽  
Dimitris I. Alexandropoulos ◽  
Brian S. Dolinar ◽  
Kim R. Dunbar
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Coupling ◽  
Magnetic Behavior ◽  
Dinuclear Complexes ◽  
Zero Field ◽  
Theoretical Predictions

Structural, magnetic and CASSCF studies were used to quantify the observed magnetic behavior of two lanthanide dinuclear complexes. The effect of soft-donor atoms was probed in order to ascertain the effect of magnetic anisotropy combined with magnetic coupling in dinuclear SMMs.

Dependence of magnetic coupling on ligands at the axial positions of NiII in phenoxido bridged dimers: experimental observations and DFT studies

2017 ◽  
Vol 46 (3) ◽  
pp. 697-708 ◽  
Author(s):  
Monotosh Mondal ◽  
Sanjib Giri ◽  
Pampa M. Guha ◽  
Ashutosh Ghosh
Keyword(s):  
Magnetic Coupling ◽  
Dft Studies ◽  
Bridging Ligands ◽  
Theoretical Results

Experimental and theoretical results reveal that the magnetic coupling in diphenoxido bridged dinuclear NiII compounds is strongly dependent on the axially coordinated non-bridging ligands.

Magnetic ordering in submonolayer Mn films on fee Co(001) and the effects of oxidation

1997 ◽  
Vol 475 ◽  
Author(s):  
W.L. O'Brien ◽  
B.P. Tonner
Keyword(s):  
Magnetic Coupling ◽  
Magnetic Ordering ◽  
Magnetization Direction ◽  
Theoretical Predictions ◽  
Oriented Parallel

Submonolayer films of Mn grown on fcc Co(001) are ferromagnetically ordered with the magnetization direction oriented parallel to the Co substrate magnetization. After exposure to oxygen the Mn atoms remain ferromagnetically ordered but their magnetization direction rotates 180 degrees and is now aligned antiparallel to the Co magnetization. This behavior in magnetic coupling between the Mn and Co films is not consistent with recent theoretical predictions.

Long-distance magnetic coupling in dinuclear copper(II) complexes with oligo-para-phenylenediamine bridging ligands

2010 ◽  
Vol 363 (8) ◽  
pp. 1666-1678 ◽  
Author(s):  
Jesús Ferrando-Soria ◽  
María Castellano ◽  
Consuelo Yuste ◽  
Francesc Lloret ◽  
Miguel Julve ◽  
...  
Keyword(s):  
Magnetic Coupling ◽  
Long Distance ◽  
Bridging Ligands ◽  
Dinuclear Copper

scholarly journals Temperature dependence of spherical electron transfer in a nanosized [Fe14] complex

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Wei Huang ◽  
Shuqi Wu ◽  
Xiangwei Gu ◽  
Yao Li ◽  
Atsushi Okazawa ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Temperature Dependence ◽  
High Spin ◽  
Magnetic Coupling ◽  
Atomic Layer ◽  
Transition Metal Clusters ◽  
Layered Shell ◽  
Electron Hopping ◽  
Bridging Ligands ◽  
Mössbauer Measurements

AbstractThe study of transition metal clusters exhibiting fast electron hopping or delocalization remains challenging, because intermetallic communications mediated through bridging ligands are normally weak. Herein, we report the synthesis of a nanosized complex, [Fe(Tp)(CN)3]8[Fe(H2O)(DMSO)]6 (abbreviated as [Fe14], Tp−, hydrotris(pyrazolyl)borate; DMSO, dimethyl sulfoxide), which has a fluctuating valence due to two mobile d-electrons in its atomic layer shell. The rate of electron transfer of [Fe14] complex demonstrates the Arrhenius-type temperature dependence in the nanosized spheric surface, wherein high-spin centers are ferromagnetically coupled, producing an S = 14 ground state. The electron-hopping rate at room temperature is faster than the time scale of Mössbauer measurements (<~10−8 s). Partial reduction of N-terminal high spin FeIII sites and electron mediation ability of CN ligands lead to the observation of both an extensive electron transfer and magnetic coupling properties in a precisely atomic layered shell structure of a nanosized [Fe14] complex.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

1993 ◽  
Vol 51 ◽  
pp. 1038-1039 ◽  
Author(s):  
G.A. Bertero ◽  
R. Sinclair
Keyword(s):  
Remanent Magnetization ◽  
Strong Influence ◽  
Uniaxial Anisotropy ◽  
Magnetic Coupling ◽  
Recording Media ◽  
Magnetic Media ◽  
Signal To Noise ◽  
Out Of Plane ◽  
Longitudinal Recording ◽  
The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

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