公开(公告)号：US20110007426A1

公开(公告)日：2011-01-13

申请号：US12502104

申请日：2009-07-13

申请人： Jiaoming Qiu ,  Kaizhong Gao ,  Yonghua Chen ,  Beverley Craig ,  Zhongyan Wang ,  Vladyslav A. Vas'ko

发明人： Jiaoming Qiu ,  Kaizhong Gao ,  Yonghua Chen ,  Beverley Craig ,  Zhongyan Wang ,  Vladyslav A. Vas'ko

IPC分类号： G11B5/33

CPC分类号： G11B5/127 ,  G11B5/39 ,  G11B5/3932

摘要： A magnetoresistive sensor having a trilayer sensor stack with two ferromagnetic freelayers separated by a nonmagnetic spacer layer is disclosed. The sensor is biased with a back biasing magnet adjacent a back of the trilayer sensor. The back biasing magnet, the trilayer sensor stack, or both have substantially trapezoidal shapes to enhance the biasing field and to minimize noise. In some embodiments, the trilayer sensor or back bias magnet have a shape designed to stabilize a micromagnetic “C” shape or concentrate magnetic flux in the trilayer sensor stack.

摘要翻译： 公开了具有由非磁性间隔层隔开的两个铁磁自由电感器的三层传感器堆叠的磁阻传感器。 传感器被偏置在靠近三层传感器背面的背偏置磁体。 背偏置磁体，三层传感器堆叠或两者具有基本上梯形的形状以增强偏置场并且使噪声最小化。 在一些实施例中，三层传感器或反偏置磁体具有设计成稳定微磁“C”形状或将三维层传感器堆叠中的磁通量集中的形状。