Room temperature ferromagnetic behavior of GaN nanoceramics

摘要

It is shown that the GaN nanoceramics fabricated by low-temperature high-pressure technique exhibit ferromagnetic behavior. The measurements reveal that the magnetization of GaN nanoceramics increased with the sintering pressure to 8 GPa applied in the fabrication process of nanoceramics. It is suggested that the magnetostriction mechanism is responsible for the observed increase of ferromagnetism in GaN nanoceramics. The magnetization of GaN nanoceramic measured at 2 K has decreased nonlinearly with applied pressure by orders of magnitude, reaching a minimum at 4 GPa. It was shown that the magnetization of GaN nanoceramics demonstrates hysteresis behavior.