Title :
Effects of Fe/Pt ratio on the magnetic properties and corrosion behavior of nanocomposite FePtB ribbons
Author :
Chang, C.W. ; Chang, H.W. ; Chiu, C.H. ; Chang, W.C.
Author_Institution :
Dept. of Phys., Nat. Chung Chen Univ., Ming-Hsiung, Taiwan
Abstract :
In this study, the Fe/Pt ratio effect on the magnetic properties and phase evolution of FePtB-type nanocomposite ribbons is examined. Also, the differences in magnetic properties and corrosion behavior between binary FePt and ternary FePtB ribbons are compared. Remanent magnetization and reduced remanence ratio are improved drastically from 21.5-33 emu/g and 0.39-0.74, respectively for binary FePt ribbons to 27.6-61.2 emu/g and 0.77-0.86 for the studied ternary FePtB ribbons. Increasing Fe/Pt ratio is found to change the type of ferrous borides and their volume fraction, which enhances the exchange-coupling effect between grains and the magnetic properties drastically. Even though FePtB ribbons exhibit higher magnetic performance than that of FePt, however, they are susceptible to corrosion due to existence of Fe-B phases in the ribbons.
Keywords :
boron alloys; corrosion; exchange interactions (electron); ferromagnetic materials; grain size; iron alloys; nanocomposites; platinum alloys; remanence; FePt; FePtB; corrosion behavior; exchange-coupling effect; grains; nanocomposite ribbons; phase evolution; remanence ratio; remanent magnetization; volume fraction; Boron alloys; Corrosion; Iron; Magnetic properties; Permanent magnets; Sun;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463593
