Suppression of spin momentum transfer and related torques in magnetoresistive elements

A magnetoresistive element having reduced spin momentum transfer induced noise, the magnetoresistive element comprising:

• a ferromagnetic free layer having a first magnetic moment and having a magnetization that rotates in response to an external magnetic field;
• a first ferromagnetic reference layer positioned adjacent to a first side of the magnetic free layer and having a second magnetic moment that is greater than the first magnetic moment of the ferromagnetic free layer;
• a second ferromagnetic reference layer positioned adjacent to a second side of the magnetic free layer and having a third magnetic moment that is greater than the first magnetic moment of the ferromagnetic free layer;
• a first non-magnetic spacer layer positioned between the ferromagnetic free layer and the first ferromagnetic reference layer;
• a second non-magnetic spacer layer positioned between the ferromagnetic free layer and the second magnetic reference layer;
• and
• a source of magnetic field for biasing the first and second ferromagnetic reference layers.

A data storage system, comprising:

• a storage media;
• and
• a recording device positioned adjacent to the storage media wherein the recording device includes a read element, the read element comprising:
• a ferromagnetic free layer having a first magnetic moment and having a magnetization that rotates in response to an external magnetic field;
• a first ferromagnetic reference layer positioned adjacent to a first side of the ferromagnetic free layer and having a second magnetic moment that is greater than the first magnetic moment of the ferromagnetic free layer;
• a second ferromagnetic reference layer positioned adjacent to a second side of the ferromagnetic free layer and having a third magnetic moment that is greater than the first magnetic moment of the ferromagnetic free layer;
• a first non-magnetic spacer layer positioned between the ferromagnetic free layer and the first ferromagnetic reference layer;
• a second non-magnetic spacer layer positioned between the ferromagnetic free layer and the second ferromagnetic reference layer;
• and
• a source of magnetic field for biasing the first and second ferromagnetic reference layers.