Dual FGL and dual SPL spintronic device to reduce perpendicular field at writing location

A magnetic recording head comprising:

• a shield;
• a main pole;
• and
• a spintronic device disposed between the shield and the main pole, the spintronic device comprising:
• a first spin kill layer disposed adjacent to the main pole;
• a first spin polarization layer;
• a first field generation layer;
• a second spin kill layer;
• a second spin polarization layer;
• a second field generation layer disposed adjacent to the shield, wherein the second spin polarization layer is disposed between the first field generation layer and the second field generation layer;
• and
• one or more negative beta material layers disposed between the main pole and the second spin polarization layer.

A magnetic recording device, comprising:

• a magnetic recording head, the magnetic recording head comprising:
• a shield;
• a main pole;
• and
• a spintronic device disposed between the shield and the main pole, the spintronic device comprising:
• a first spin kill layer disposed adjacent to the main pole;
• a first spin polarization layer;
• a first field generation layer;
• a second spin kill layer, wherein the first and second spin kill layers each individually comprises a non-magnetic material having a resistivity greater than about 100 nano-Ohm·m;
• a second spin polarization layer;
• a second field generation layer disposed adjacent to the shield, wherein the second spin polarization layer is disposed between the first field generation layer and the second field generation layer;
• and
• one or more negative beta material layers disposed between the main pole and the second spin polarization layer, wherein each of the one or more negative beta material layers comprises FeCr;
• and
• means for flowing a current from the main pole through the spintronic device to the shield.