PATENT CLAIM ANALYSIS

Application Number: 16007014
Application Type: Utility
Filing Date: 2018-06
Publication Date: 2019-12
Patent Classification: ["360", "319000"]

Abstract:
A bottom shield in a read head is modified by including a non-magnetic decoupling layer and second magnetic layer on a conventional first magnetic layer. The second magnetic layer has a magnetization that is not exchange coupled to the first magnetic layer, and a domain structure that is not directly affected by stray fields due to domain wall motion in the first magnetic layer. Accordingly, the modified bottom shield reduces shield related noise on the reader and will provide improved signal to noise (SNR) ratio and better reader stability. The second magnetic layer may be further stabilized with one or both of an antiferromagnetic coupling scheme, and insertion of an antiferromagnetic pinning layer. In dual readers, the modified bottom shield is used in either the bottom or top reader although in the latter, first magnetic layer thickness is reduced to maintain reader-to-reader spacing and acceptable bit error rate (BER).

Claim (Index 1):
A magnetic read head structure formed on a slider in a head gimbal assembly (HGA), comprising:\n (a) a first magnetoresistive (MR) sensor formed on a first bottom shield and with a front side at an air bearing surface (ABS), and wherein the first MR sensor has a first free layer with a first magnetization in a first cross-track direction, and sidewalls that extend from a top surface thereof to the first bottom shield; (b) the first bottom shield, comprising:\n (1) a bottommost magnetic layer having a first thickness (t), a width (w) between two sides thereof, and a height (h) between a front side at the ABS and a backside; \n (2) an uppermost magnetic layer that is a single layer and has a second magnetization in the first cross-track direction, and having a second thickness that is substantially less than the first thickness; and \n (3) a non-magnetic decoupling layer between that adjoins a top surface of the bottommost magnetic layer, and contacts a bottom surface of the uppermost magnetic layers that, and wherein the non-magnetic decouplinq layer decouples the second magnetization from a magnetization in the bottommost magnetic layer; and \n (c) a first junction shield that is adjacent to the first MR sensor sidewalls, and having a third magnetization in the cross-track direction that provides a bias field in the cross-track direction to stabilize the first magnetization in the free layer.

Metadata:
- Claim Count in Document: 64.0
- Percentile: 94.0
- Lexical Diversity: 1.85227
- Patent Class: 360.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15357070', '13785255', '15345813', '13785227', '15790342']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7338970700242989
- 35 USC 102 Novelty (BERT): 0.5288634869828707
- Combined Prediction Score: 0.7133937117201561
- Mean Citation Score: 317.403116
- Max Citation Score: 358.8119
- Similarity Product: 313.6485493681312

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test