New avenues to efficient chemical synthesis of exchange coupled hard/soft nanocomposite magnet.
Nd-Fe-B ultrafine amorphous alloy particles were prepared by reaction of metal ions with borohydride in aqueous solution. Monodispersed Fe nanoparticles were synthesized under an argon atmosphere via thermal decomposition of Fe(2+)-oleate2. Exchange coupled Nd2Fe14B/Fe nanocomposite magnets have been prepared by self-assembly using surfactant. The crystal structure of the synthesized nanoparticles was identified by using X-ray powder diffraction (XRD). The size and shape of nanoparticles were obtained by transmission electron microscope (TEM). Thermogravimetry using a microbalance with magnetic field gradient positioned below the sample was used for the measurement of a thermomagnetic analysis (TMA) curve showing the downward magnetic force versus temperature.
Lee
Don Keun
DK
Cheil Industries Inc., Gocheon-Dong, Uiwang-Si, Gyeonggi-Do 437-711, Korea.
Cha
Hyun Gil
HG
Kim
Young Hwan
YH
Kim
Chang Woo
CW
Ji
Eun Sun
ES
Kang
Young Soo
YS