Title :
Improvement of crystallinity and exchange bias field in reverse type Ni-Fe/FeMn bilayers using Si/Ni-Fe composite type of underlayers
Author :
Nakagawa, Shigeki ; Nishimura, Kosuke ; Shimizu, Yutaka ; Naoe, Masahiko
Author_Institution :
Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
Composite-type Si/Ni-Fe underlayers were examined to improve crystallinity and exchange bias characteristics of the reverse-type exchange coupled layers, such as [FeMn/Ni-Fe] bilayers. A Si underlayer promoted (111) texture of fcc crystallites in the initial growth region of Ni-Fe layer deposited on it. FeMn layers deposited on the Si/Ni-Fe bilayered underlayer exhibited excellent (111) texture of fcc crystallites. The multilayer film with Si underlayer revealed a large exchange coupling field Hex to the Ni-Fe films deposited on it after annealing in an applied field of 500 Oe. It was found that the exchange field Hex of the film with a 50 Å-thick Si underlayer revealed a large value of about 300 Oe. The Ni-Fe layer between Si and FeMn layers could possess a large exchange coupling field
Keywords :
crystallites; exchange interactions (electron); iron alloys; magnetic multilayers; manganese alloys; nickel alloys; silicon; texture; (111) texture; 50 A; Ni-Fe/FeMn bilayers; Si; Si-NiFe-FeMn-NiFe; Si/Ni-Fe composite-type underlayers; Si/Ni-Fe/FeMn; crystallinity; exchange bias field; fcc crystallites; multilayer film; reverse-type exchange coupled layers; Annealing; Antiferromagnetic materials; Crystallization; Giant magnetoresistance; Helium; Iron; Magnetic multilayers; Nonhomogeneous media; Semiconductor films; Spin valves;
Journal_Title :
Magnetics, IEEE Transactions on
