The fuorides K3Fe5F15 and K3Cr2Fe3F15 are known as multiferroic materials. We reported the detection of a magnetic memory effect in these materials and its dependence on temperature and aging time. We succeeded in writing, reading, and deleting 3-bits of digital information in these systems. These results show that in addition to their already known magneto-electric multiferroic properties, K3Fe5F15 and K3Cr2Fe3F15 also possess a new functionality: they can be used as materials for a thermal memory cell.
COBISS.SI-ID: 26820647
By investigating the magnetism of spins on a quasiperiodic lattice, we presented an experimental study of static and dynamic magnetic properties, specifc heat, and magnetic entropy of the Gd3Au13Sn4 quasicrystalline approximant. The magnetic sublattice of Gd3Au13Sn4 is a periodic arrangement of nonoverlapping spin clusters of almost perfect icosahedral symmetry, where gadolinium localized f magnetic moments are distributed on equilateral triangles. We demonstrated that the spin system undergoes at low temperatures a transition to a nonergodic state at the spin freezing temperature Tf =2.8 K. Below this, the ergodicity is broken on the experimental timescale, because the thermally activated correlation times for the spin reorientations become macroscopically long. The magnetic properties of the site-ordered, geometrically frustrated Gd3Au13Sn4 system are discussed in comparison to site-disordered spin glasses that contain both randomness and frustration.
COBISS.SI-ID: 27364391
We studied magnetic and structural properties of CoFe2O4 nanoparticles suspended in an organic liquid. Nanoparticles had a narrow size distribution of average particle size 5.9 ± 1.0 nm. Relatively high blocking temperature at approximately 160 K enabled us to use the CoFe2O4 nanoparticles for a thermal memory cell at temperatures above 100 K. On the other hand, the nanoparticles are superparamagnetic at room temperature that makes them very suitable for various biomedical applications.
COBISS.SI-ID: 27135783