Spintronic device comprising dual FGL and dual SPL 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 field generation layer disposed adjacent to the main pole;
• a first spin polarization layer disposed over the first field generation layer;
• a first spin kill layer disposed over the first spin polarization layer;
• a second field generation layer disposed over the first spin kill layer;
• a second spin polarization layer disposed over the second field generation layer;
• a second spin kill layer disposed between the second spin polarization layer and the shield;
• and
• one or more negative beta material layers disposed between the main pole and the shield.

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 field generation layer disposed adjacent to the main pole;
• a first spin polarization layer disposed over the first field generation layer;
• a first spin kill layer disposed over the first spin polarization layer;
• a second field generation layer disposed over the first spin kill layer;
• a second spin polarization layer disposed over the second field generation layer;
• a second spin kill layer disposed between the second spin polarization layer and the shield;
• and
• one or more negative beta material layers disposed between the first spin polarization layer and the shield;
• and
• means for flowing a current from the shield through the spintronic device to the main pole.