PATENT CLAIM ANALYSIS

Application Number: 15970964
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-09
Patent Classification: ["360", "125030"]

Abstract:
A design for a microwave assisted magnetic recording device is disclosed wherein a spin torque oscillator (STO) between a main pole and write shield has a spin polarization (SP) layer less than 30 Angstroms thick and perpendicular magnetic anisotropy (PMA) induced by an interface with one or two metal oxide layers. Back scattered spin polarized current from an oscillation layer is used to stabilize SP layer magnetization. One or both of the metal oxide layers may be replaced by a confining current pathway (CCP) structure. In one embodiment, the SP layer is omitted and spin polarized current is generated by a main pole/metal oxide interface. A direct current or pulsed current is applied across the STO. Rf current may also be injected into the STO to reduce critical current density. A write gap of 25 nm or less is achieved while maintaining good STO performance.

Claim (Index 19):
A microwave assisted magnetic recording (MAMR) structure that includes a write head, comprising:\n (a) a main pole that generates a magnetic flux field which is directed through a pole tip at an air bearing surface (ABS) and into a magnetic medium to write one or more bits, the magnetic flux has a gap field component that is directed across a spin torque oscillator (STO) and into a write shield; (b) the write shield with a side at the ABS that collects magnetic flux which has passed through the magnetic medium and written the one or more bits; (c) an external current source that produces a direct current or pulsed current between the main pole and write shield, and across the STO; and (d) the STO that is formed along the ABS and generates a if field on the magnetic medium and thereby assists the writing to one or more bits, the STO comprises;\n (1) an oscillation layer (OL) wherein a spin polarized current of a critical current density that passes through a main pole interface with a seed layer causes magnetization in the OL to oscillate with a sufficiently large angle and frequency to generate the if field on the magnetic medium to assist the writing to one or more bits; \n (2) the seed layer in contact with a surface of the main pole that faces the write shield, the seed layer is a metal oxide layer, a laminated stack of metal oxide layers, or has a confining current pathway (CCP) structure having conductive pathways in a metal oxide matrix; and \n (3) a capping layer formed between the OL and the write shield.

Metadata:
- Claim Count in Document: 11.0
- Percentile: 93.0
- Lexical Diversity: 1.71277
- Patent Class: 360.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['14468399', '14987127', '14077164', '13597472', '14077168']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8054859751954455
- 35 USC 102 Novelty (BERT): 0.6817024804252344
- Combined Prediction Score: 0.7931076257184244
- Mean Citation Score: 598.614628
- Max Citation Score: 696.4758
- Similarity Product: 686.7364313847185

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test