93 research outputs found
Magnetic systems at criticality: different signatures of scaling
Different aspects of critical behaviour of magnetic materials are presented
and discussed. The scaling ideas are shown to arise in the context of purely
magnetic properties as well as in that of thermal properties as demonstrated by
magnetocaloric effect or combined scaling of excess entropy and order
parameter. Two non-standard approaches to scaling phenomena are described. The
presented concepts are exemplified by experimental data gathered on four
representatives of molecular magnets.Comment: 33 pages, 16 figure
Studies on magnetic properties of unique molecular magnet
In this paper magnetic properties of hybrid inorganic-organic compound {[FeII(pyrazole)4]2[NbIV(CN)8]∙4H2O}n are presented. This is a three dimensional molecular magnet with well localized magnetic moments, which make it a suitable candidate for testing magnetic models. In order to characterize the magnetic properties of the above compound we performed the AC/DC magnetometry in the range 0-5 T. The special attention was paid to the phase transition at 7.9 K. The study in magnetic field supports magnetic ordering below 7.9 K
Photo-induced relaxation of magnetization in molecular magnet
The experimental study of photo-induced magnetization of hybrid
molecular magnet containing cobalt(II) and tungsten(V) magnetic centers
bridged by 4,40
-bpy and CN− is presented. The observed increase in magnetization rate is attributed to the defects due to inter-valence transfer between
CoIIWV *) CoIIIWIV. The time evolution of magnetization is parameterized
by the power law rather than exponential function
Enforcing Multifunctionality: A Pressure-Induced Spin-Crossover Photomagnet
Photomagnetic compounds are usually
achieved by assembling preorganized
individual molecules into rationally designed molecular architectures
via the bottom-up approach. Here we show that a magnetic response
to light can also be enforced in a nonphotomagnetic compound by applying
mechanical stress. The nonphotomagnetic cyano-bridged Fe<sup>II</sup>–Nb<sup>IV</sup> coordination polymer {[Fe<sup>II</sup>(pyrazole)<sub>4</sub>]<sub>2</sub>[Nb<sup>IV</sup>(CN)<sub>8</sub>]·4H<sub>2</sub>O}<sub><i>n</i></sub> (<b>FeNb</b>) has been
subjected to high-pressure structural, magnetic and photomagnetic
studies at low temperature, which revealed a wide spectrum of pressure-related
functionalities including the light-induced magnetization. The multifunctionality
of <b>FeNb</b> is compared with a simple structural and magnetic
pressure response of its analog {[Mn<sup>II</sup>(pyrazole)<sub>4</sub>]<sub>2</sub>[Nb<sup>IV</sup>(CN)<sub>8</sub>]·4H<sub>2</sub>O}<sub><i>n</i></sub> (<b>MnNb</b>). The <b>FeNb</b> coordination polymer is the first pressure-induced spin-crossover
photomagnet
Photomagnetism in cyano-bridged hexanuclear clusters [MnII(bpy)2]4[MIV(CN)8]2.xH2O (M = Mo, x = 14, and M = W, x = 9)
The magnetic and photomagnetic properties of two cyano-bridged, [Mn(bpy)2]4[Mo(CN)8]2·14H2O (1) and [Mn(bpy)2]4[W(CN)8]2·9H2O (2) (bpy = 2,2'-bipyridyl), hexanuclear clusters (hereafter named MnII4MIV2) have been investigated..
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