Title :
The influence of anneal time on exchange-coupling in Nd2Fe14B/α-Fe films
Author :
Jiang, H. ; O´Shea, M.J.
Author_Institution :
Dept. of Phys., Kansas State Univ., Manhattan, KS, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
We study the influence of α-Fe content and anneal time on the magnetic properties and exchange-spring behavior of Nd2Fe 14B/α-Fe thin films treated with a rapid (30 second) or standard (20 minute) anneal. A rapid anneal gives the highest energy product, 12.6 MGOe at an anneal temperature of 750°C along with a coercivity of 10.8 kOe. The exchange-spring behavior was evaluated using recoil demagnetization curves. The reversibility of the recoil demagnetization curves increases with the α-Fe content. Analysis of these results indicate a dominant positive interaction between exchange coupled grains for the thin films as long as the Fe content is not too large
Keywords :
boron alloys; coercive force; demagnetisation; exchange interactions (electron); ferromagnetic materials; interface magnetism; iron; iron alloys; magnetic hysteresis; magnetic thin films; magnetisation reversal; nanostructured materials; neodymium alloys; permanent magnets; rapid thermal annealing; remanence; sputtered coatings; 20 min; 30 sec; 750 C; Nd2Fe14B-Fe; RTA; alpha phase content influence; anneal time influence; coercivity; energy product; exchange coupled grains; exchange-coupling; exchange-spring behavior; grain size; hard magnet; hysteresis; magnetic properties; magnetic thin films; positive interaction; recoil demagnetization curves; remanence; sputtered films; Coercive force; Demagnetization; Iron; Magnetic films; Magnetic properties; Neodymium; Niobium; Plasma temperature; Rapid thermal annealing; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
