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US 2015/0103431 A1Published application
Sto with anti-ferromagnetic coupling interlayer
AssigneeHGST Netherlands B.V.
InventorsMasukaza IGARASHI, Keiichi NAGASAKA, Masato SHIIMOTO
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Abstract
Embodiments described herein generally relate to a magnetic recording device for recording/reproducing data using the magnetization state of a recording medium. More specifically, embodiments described herein provide an STO structure having an SPL and an FGL with an anti-ferromagnetic coupling interlayer disposed between the SPL and FGL. The anti-ferromagnetic coupling interlayer may enable the STO structure to obtain a high assist effect even when operated with a low conducting current.
Claims20
A microwave assisted magnetic recording (MAMR) head, comprising:
- a main magnetic pole;
- a trailing shield;
- a spin-torque oscillator (STO) disposed between the main magnetic pole and the trailing shield, the STO comprising:
- a first magnetic layer;
- an anti-ferromagnetic coupling interlayer;
- and
- a second magnetic layer, wherein the first magnetic layer, the anti-ferromagnetic coupling interlayer, and the second magnetic layer are laminated in order from the main magnetic pole, and wherein an anti-ferromagnetic coupling energy of the first magnetic layer and the second magnetic layer is between about −0.2 erg/cm2 and about −4.0 erg/cm2.
4 more elements
Dependencies are inferred from the claim text.