Efficient enhancement of magnetic anisotropy by optimizing the ligand-field in a typically tetranuclear dysprosium cluster

2015 ◽  
Vol 44 (17) ◽  
pp. 8150-8155 ◽  
Author(s):  
Jiang Liu ◽  
Yan-Cong Chen ◽  
Zhong-Xia Jiang ◽  
Jun-Liang Liu ◽  
Jian-Hua Jia ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Thermal Energy ◽  
Ligand Field ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Applied External Magnetic Field

Two tetranuclear dysprosium single molecule magnets under a zero applied external magnetic field showing high thermal energy barriers which are among the highest within the reported tetranuclear lanthanide-based SMMs.

Enhanced energy barriers triggered by magnetic anisotropy modulation via tuning the functional groups on the bridging ligands in Dy2 single-molecule magnets

2018 ◽  
Vol 47 (42) ◽  
pp. 15197-15205 ◽  
Author(s):  
Yaru Qin ◽  
Yu Jing ◽  
Yu Ge ◽  
Wei Liu ◽  
Yahong Li ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Functional Groups ◽  
Single Molecule ◽  
Energy Barrier ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Bridging Ligands

Two dinuclear dysprosium complexes of 1 and 2 have been synthesized and both of them exhibit SMM behavior. The energy barrier is enhanced ca. 35 K by elaborately tuning the backbones of the ligands.

A ligand-field study of the ground spin-state magnetic anisotropy in a family of hexanuclear Mn(iii) single-molecule magnets

2008 ◽  
pp. 2277 ◽  
Author(s):  
Stergios Piligkos ◽  
Jesper Bendix ◽  
Høgni Weihe ◽  
Constantinos J. Milios ◽  
Euan K. Brechin
Keyword(s):  
Magnetic Anisotropy ◽  
Field Study ◽  
Spin State ◽  
Single Molecule ◽  
Ligand Field ◽  
Single Molecule Magnets ◽  
Ground Spin State

QUALITATIVE COMPARISON OF THE THERMODYNAMICS OF Mn12-ac AND Fe8 MOLECULE MAGNETS FOR Dβ ~ 0.031

2011 ◽  
Vol 25 (15) ◽  
pp. 1281-1291
Author(s):  
M. T. THOMAZ ◽  
ONOFRE ROJAS ◽  
E. V. CORRÊA-SILVA
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Specific Heat ◽  
Excited States ◽  
Single Molecule ◽  
Easy Axis ◽  
Unexpected Result ◽  
Single Molecule Magnets ◽  
Qualitative Comparison ◽  
Percentage Difference

The magnetization and the specific heat of two single molecule magnets (SMM) with spin-10, Mn 12- ac and Fe 8, are compared for Dβ ~ 0.031. The rhombic term in the Fe 8 molecule makes the x-component of its magnetization to be larger than that of the Mn 12- ac molecule. The axial symmetry of the Mn 12- ac favors the z-component of its magnetization, in comparison to the Fe 8 molecule. For T ≳ 18 K, the specific heat of the Mn 12- ac is large (80%, at most) than that of the Fe 8, at the same temperature. The corrections from the S = 9 excited states of these SMM's do not invalidate our results. An unexpected result occurs when the angle between the easy-axis and the external magnetic field equals π/4: the aforementioned percentage difference of the specific heat reaches 3% for D β ≲ 0.025 and h/k ∈[1.93, 2.04], when they are compared at distinct temperatures [Formula: see text]. This small percentage difference also happens for the average specific heat of both SMM's at those temperatures and h/D Mn ∈ [1.97, 2.1].

Magnetic Relaxation of Single-Molecule Magnets in an External Magnetic Field: An Ising Dimer of a Terbium(III)-Phthalocyaninate Triple-Decker Complex

2010 ◽  
Vol 17 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Keiichi Katoh ◽  
Takashi Kajiwara ◽  
Motohiro Nakano ◽  
Yasuhiro Nakazawa ◽  
Wolfgang Wernsdorfer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Single Molecule Magnets

Rare CH3O−/CH3CH2O−-bridged nine-coordinated binuclear DyIII single-molecule magnets (SMMs) significantly regulate and enhance the effective energy barriers

CrystEngComm ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1712-1724 ◽  
Author(s):  
Sheng Zhang ◽  
Nan Shen ◽  
Sha Liu ◽  
Rong Ma ◽  
Yi-Quan Zhang ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Single Molecule ◽  
Effective Energy ◽  
Energy Barriers ◽  
Single Molecule Magnets ◽  
Efficient Approach

This work presents an efficient approach to regulating and enhancing the magnetic anisotropy barriers through using bridged CH3O− anion or CH3CH2O− anion and constructing triple bridges.

INFLUENCE OF AN EXTERNAL MAGNETIC FIELD ON THE DYNAMICS OF A NEW-PHASE NUCLEUS IN THE VICINITY OF THE FIRST-ORDER PHASE TRANSITION IN MAGNETS WITH DEFECTS PRESENT

2012 ◽  
Vol 26 (28) ◽  
pp. 1250183 ◽  
Author(s):  
VLADIMIR NAZAROV ◽  
RISHAT SHAFEEV
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
External Magnetic Field ◽  
Magnetic Anisotropy ◽  
Spin Reorientation ◽  
Critical Fields ◽  
First Order ◽  
Phase Nucleus ◽  
First Order Phase Transition ◽  
New Phase

Theoretically, with the aid of a soliton model, the evolution of a new-phase nucleus near the first-order spin-reorientation phase transition in magnets has been investigated in an external magnetic field. The influence of an external field and one-dimensional defects of magnetic anisotropy on the dynamics of such nucleus has been demonstrated. The conditions for the localization of the new-phase nucleus in the region of the magnetic anisotropy defect and for its escape from the defect have been determined. The values of the critical fields which bring about the sample magnetization reversal have been identified and estimated.

Magnetic anisotropy on demand exploiting high-pressure as remote control: an ab initio proof-of-concept

2021 ◽  
Author(s):  
Matteo Briganti ◽  
Federico Totti
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Remote Control ◽  
Magnetic Anisotropy ◽  
Ab Initio ◽  
Single Molecule ◽  
Boiling Temperature ◽  
Proof Of Concept ◽  
Single Molecule Magnets ◽  
On Demand

Lanthanide based single molecule magnets have recently become very promising systems for creating single molecule device working at high temperature (nitrogen boiling temperature). However, the variation of direction of the...

scholarly journals High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

2009 ◽  
Vol 152-153 ◽  
pp. 373-376 ◽  
Author(s):  
Stanislav O. Volchkov ◽  
Andrey V. Svalov ◽  
G.V. Kurlyandskaya
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Finite Elements ◽  
Magnetic Anisotropy ◽  
Constant Magnetic Field ◽  
High Frequency ◽  
Complex Impedance ◽  
Rf Sputtering ◽  
Frequency Range

In this work magnetoimpedance (MI) behaviour was studied experimentally for Fe19Ni81(175 nm)/Cu(350 nm)/Fe19Ni81(175 nm) sensitive elements deposited by rf-sputtering. A constant magnetic field was applied in plane of the sandwiches during deposition perpendicular to the Cu-lead in order to induce a magnetic anisotropy. Sandwiches with different width (w) of FeNi parts were obtained. The complex impedance was measured as a function of the external magnetic field for a frequency range of 1 MHz to 700 MHz for MI elements with different geometries. Some of MI experimental data are comparatively analysed with finite elements numerical calculations data. The obtained results can be useful for optimization of the design of miniaturized MI detectors.

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