Patent ID: 8169753
Filing Date: 2012-05-01
Classification: B82Y,G01R,G11B,H01F,H01L,Y10T

Abstract:
1. A CPP tunneling magnetoresistance (TMR) read sensor, comprising: a ferromagnetic amorphous buffer layer; a ferromagnetic polycrystalline seed layer on the buffer layer; an antiferromagnetic pinning layer on the seed layer; a ferromagnetic keeper layer on the pinning layer; an antiparallel coupling, layer on the keeper layer; multiple ferromagnetic reference layers on the antiparallel coupling layer; a barrier layer on the multiple reference layers; multiple ferromagnetic sense layers on the barrier layer; a nonmagnetic cap layer on the multiple sense layers; and a ferromagnetic cap layer on the nonmagnetic cap layer; wherein the multiple sense layers comprise: a first sense layer formed by a Co—Fe film; a second sense layer formed by a Co—Fe—B film; and a third sense layer formed by a Co—Fe—Hf film.