Abstract
The study of magnetic relaxations in Mn12-stearate single-molecule magnets deposited on the surface of spherical silica nanoparticles was performed. For such a purpose, the investigation of AC magnetic susceptibility dependence on the frequency and temperature was performed. Based on the Argand plots obtained for different temperatures and temperature dependencies of susceptibility, obtained for different frequencies of AC field, the corresponding relaxation times were derived. Fitting to the Arrhenius law revealed the values of an effective energy barrier and a mean relaxation time, which were consistent for both measuring techniques (Ueff/kB∼ 50 K and τ0∼ 10−7 s) and similar to the corresponding values for the analogous bulk compounds. Additionally, the obtained relaxation parameters for the Mn12-stearate molecules on the spherical silica surface were compared with corresponding values for the Mn12-based single-molecule magnets deposited upon other types of nanostructured silica surface.
Highlights
Introduction the Spherical Silica SurfaceNowadays, significant effort is being dedicated to the design and manufacture of new nanosized materials with specific magnetic properties
Significant effort is being dedicated to the design and manufacture of new nanosized materials with specific magnetic properties. Very attractive from such a point of view seems to be the single-molecule magnets (SMMs)—low dimensional molecules consisting of coupled paramagnetic metal ions, possessing unique magnetic properties available at the molecular level [1,2]
A common way to determine the relaxation time is the so-called Cole–Cole plot [16], known in magnetism as the Argand plot [17], where χ versus χ is plotted for a given temperature and different angular frequencies ω
Summary
Significant effort is being dedicated to the design and manufacture of new nanosized materials with specific magnetic properties Very attractive from such a point of view seems to be the single-molecule magnets (SMMs)—low dimensional molecules consisting of coupled paramagnetic metal ions, possessing unique magnetic properties (magnetic hysteresis, slow magnetic relaxations, quantum tunneling effects) available at the molecular level [1,2]. To have the possibility of manipulating individual molecules for the realization of nanoelectronic devices, it is necessary to deposit and separate SMMs on the solid surface [4] In this aim, different techniques and methods, as well as different types of SMMs and solid substrate materials were applied and described in the literature. A variety of complexes of the most commonly used families of SMMs, Mn12 and Fe4 , have been designed for direct deposition on gold substrate [6,7,8,9]
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