| 摘要 |
The invention provides a current-perpendicular-to-plane (CPP) tunneling magnetoresistance (TMR) or giant magnetoresistance (GMR) read sensor with multiple ferromagnetic sense layers. In one embodiment of the invention, a CPP TMR read sensor comprises a first sense layer formed by a ferromagnetic polycrystalline Co-Fe film, a second sense layer formed by a ferromagnetic interstitial-type amorphous Co-Fe- B film, a third sense layer formed by a ferromagnetic substitute-type amorphous Co-Fe-X film where X is Hf, Zr or Y, and a fourth sense layer formed by a ferromagnetic Ni-Fe film. The third sense layer acts as a diffusion barrier layer to suppress Ni diffusion, thus allowing the incorporation of the Ni-Fe fourth sense layer for improving ferromagnetic properties of the multiple sense layers. The multiple sense layers induce spin-dependent scattering, thus facilitating the CPP TMR read sensor to exhibit a strong TMR effect.
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