Reduction of a coercive field without substantial current shunt by an additional CoFeB layer in GMR spin valve

Author

Nam, Chunghee ; Cho, B.K.

Author_Institution

Dept. of Mater. Sci. & Eng., Gwangju Inst. of Sci. & Technol., South Korea

fYear

2005

fDate

4-8 April 2005

Firstpage

1711

Lastpage

1712

Abstract

The effects of an additional CoFeB layer to a CoFe free layer is investigated in a GMR spin valve. The GMR behavior as a function of t_f for the sample with and without the additional layer shows a similar tendency after thermal annealing at T = 275°C. The addition of CoFeB layer to the CoFe free layer seems to suppress the substantial current shunt which can be attributed to the high sensitivity of it. In particular, a higher sensitivity by 1.5 times is obtained on the free layer of CoFe/CoFeB compared to that normal spin-valve with CoFe free layer. This suggests that the coercivity of the sample with the additional layer is reduced with increasing t_f without critical current shunt.

Keywords

boron alloys; cobalt alloys; coercive force; critical currents; ferromagnetic materials; giant magnetoresistance; iron alloys; spin valves; 275 degC; CoFe-CoFeB; GMR spin valve; coercive field; critical current shunt; free layer; sensitivity; thermal annealing; Amorphous materials; Annealing; Giant magnetoresistance; Magnetic materials; Magnetic resonance; Magnetic sensors; Materials science and technology; Polarization; Reflection; Thermal resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464289

Filename

1464289