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US 9,311,945 B2Granted
Magnetic head for microwave assisted magnetic recording
AssigneeHGST Netherlands B.V.
InventorsKenichiro Takahashi, Junguo Xu, Jianhua Li, Masaru Furukawa
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Abstract
Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO and an embedded contact sensor (ECS). The STO and the ECS are electrically connected in series and are connected to the same terminals. During operation, the current applied to the STO is controlled with respect to a change in resistance of the ECS.
Claims10
A microwave assisted magnetic recording head, comprising:
- a spin torque oscillator;
- and
- a contact sensor electrically coupled to the spin torque oscillator, wherein a distance between the spin torque oscillator and the contact sensor is greater than a result of a formula:
- 10−7*(R/60)*(2*π*r), wherein R is a disk rotational speed in rotations per minute and r is a levitated radial position of a slider with respect to a disk in millimeters.
1 more element
A microwave assisted magnetic recording head, comprising:
- a spin torque oscillator having a first width;
- and
- a contact sensor electrically coupled to the spin torque oscillator, wherein the contact sensor has a second width that is greater than the first width, and wherein the second width is greater than a result of a formula:
- W1+Tan A1*D+Tan A2*D, wherein W1 is the first width, A1 and A2 are skew angles with respect to the spin torque oscillator and the contact sensor and D is a distance between the spin torque oscillator and the contact sensor.
1 more element
Dependencies are inferred from the claim text.