CoxC nanorod magnets: Highly magnetocrystalline anisotropy with lower Curie temperature for potential applications

Room temperature magnetocaloric effect in Mn1.25Fe1.75Ga Heusler alloys

“…Such calculations yield RCP values of 0.3, 6.8, 20, 59, 106 J/kg for ΔSM measured at 0.1, 0.5, 1, 2, 3 T, respectively. These values are comparable to those reported in other materials [13][14][15][16] .…”

“…In order to investigate the magnetocaloric properties of the synthesized samples, the dependence of magnetization on external magnetic field up to 3 T was measured. numerically from the Maxwell relation [14][15][16] . The ΔSM values estimated at different temperatures in a magnetic field of 0.1, 0.5, 1, 2, and 3 T for Mn1.25Fe1.75Ga alloy are shown in Fig.…”

“…behavior for numerous applications such as heat pumps, high-temperature cooling, and, most particularly, heat conversion. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Magnetocaloric heat conversion systems aim at transforming heat into mechanical or electrical energy. The intense research activity over the past fifteen years on room-temperature magnetic refrigeration has led to the discovery of numerous performing magnetocaloric materials with working temperature around 300 K. Previous studies have shown that the Ni-Mn-Ga alloys are common candidates as magnetic refrigerant materials.…”

Enhanced magnetic anisotropy in cobalt-carbide nanoparticles

“…On the other hand, information regarding the shape of the particles can be determined from the T C dependence on particle size by applying cohesive energy model to our material ( Figure 5(b)). 6 As seen from the plot, T C exhibits a linear relation with the number of atoms that is directly proportional to the particle size for 3 different shapes, such as sphere, cube, and cylinder. By comparing our result to the plot, we have found that our experimentally obtained T C lies in the range of cylindrical shaped nanoparticles which is consistent with our TEM image.…”

“…Magnetic nanoparticles are key to the high-density memory storage, targeted drug delivery, and a variety of other industrial and medical applications, including components in nano-electronic circuits. [1][2][3][4][5][6] Starting from the bulk magnetic material, the decrease in size smaller than the typical domain size results in a nanomagnet where the atomic moments are exchange coupled. This causes the particle to behave like a giant magnet with a moment Nl, where N is the number of atoms while l is the moment per atom.…”