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[20p-E318-2] Magnetic properties of Al nanoparticle and Al nanoparticle/Ag nanoparticle composites prepared by pulsed laser ablation method
Keywords:Al nanoparticle, Magnetic properties
We report the magnetic properties of aluminum nanoparticles (AlNPs) and composites of AlNP and silver nanoparticles (AgNPs). The magnetic properties of the AlNP powder were measured by SQUID. The M-H curve showed superparamagnetism. But Pauli paramagnetic component was not found from M-T curve. The magnetic properties of the composite of AlNP and AgNP ((AlNP)/(AgNP)) showed interesting properties. Here, the number ratio of AlNPs and AgNPs in the composite material is expressed as (AlNP) x (AgNP) 1-x. Basically, the magnetic properties of the composite material were superparamagnetic. Although the magnitude of its saturation magnetization increased with the value of x, it did not increase monotonically but reached a maximum when x = 0.8. In the M-T curves of the composites, there was a paramagnetic component independent of the temperature. The value of this
paramagnetic component was also not proportional to the value of x, and it was the maximum when x = 0.4. This
result suggests that the paramagnetic component is not due to defects but Pauli paramagnetism. Even more
surprisingly, hysteresis was observed in the M-H curve for the samples with x = 0.6 and 0.8, indicating that the
samples are ferromagnetic material. Although the origin and mechanisms of the magnetic properties of these
composite materials are under investigation, the experimental results show that the unique magnetic moment is
induced in the composites and the existence of the magnetic exchange interaction inside the composites.
paramagnetic component was also not proportional to the value of x, and it was the maximum when x = 0.4. This
result suggests that the paramagnetic component is not due to defects but Pauli paramagnetism. Even more
surprisingly, hysteresis was observed in the M-H curve for the samples with x = 0.6 and 0.8, indicating that the
samples are ferromagnetic material. Although the origin and mechanisms of the magnetic properties of these
composite materials are under investigation, the experimental results show that the unique magnetic moment is
induced in the composites and the existence of the magnetic exchange interaction inside the composites.