High-Resolution Backside GMR Magnetic Current Imaging on a Contour-Milled Globally Ultrathin Die

2014 ◽  
Author(s):  
D. Vallett ◽  
J. Gaudestad ◽  
C. Richardson
Keyword(s):  
Quantum Interference ◽  
Flip Chip ◽  
Milling Process ◽  
Dramatic Improvement ◽  
Superconducting Quantum Interference Device ◽  
Density Peak ◽  
Magnetic Current ◽  
Gmr Sensors ◽  
Silicon Thickness ◽  
A Current

Abstract Magnetic current imaging (MCI) using superconducting quantum interference device (SQUID) and giant-magnetoresistive (GMR) sensors is an effective method for localizing defects and current paths [1]. The spatial resolution (and sensitivity) of MCI is improved significantly when the sensor is as close as possible to the current paths and associated magnetic fields of interest. This is accomplished in part by nondestructive removal of any intervening passive layers (e.g. silicon) in the sample. This paper will present a die backside contour-milling process resulting in an edge-to-edge remaining silicon thickness (RST) of < 5 microns, followed by a backside GMR-based MCI measurement performed directly on the ultra-thin silicon surface. The dramatic improvement in resolving current paths in an ESD protect circuit is shown as is nanometer scale resolution of a current density peak due to a power supply shortcircuit defect at the edge of a flip-chip packaged die.

scholarly journals A tandem giant magnetoresistance assay for one-shot quantification of clinically relevant concentrations of N-terminal pro-B-type natriuretic peptide in human blood

2021 ◽  
Author(s):  
Fanda Meng ◽  
Weisong Huo ◽  
Jie Lian ◽  
Lei Zhang ◽  
Xizeng Shi ◽  
...  
Keyword(s):  
Detection Limit ◽  
Giant Magnetoresistance ◽  
Dynamic Range ◽  
Point Of Care ◽  
Sample Volume ◽  
Small Sample ◽  
Broad Dynamic Range ◽  
Gmr Sensors ◽  
Gmr Sensor ◽  
Sample Volume Requirement

AbstractWe report a microfluidic sandwich immunoassay constructed around a dual-giant magnetoresistance (GMR) sensor array to quantify the heart failure biomarker NT-proBNP in human plasma at the clinically relevant concentration levels between 15 pg/mL and 40 ng/mL. The broad dynamic range was achieved by differential coating of two identical GMR sensors operated in tandem, and combining two standard curves. The detection limit was determined as 5 pg/mL. The assay, involving 53 plasma samples from patients with different cardiovascular diseases, was validated against the Roche Cobas e411 analyzer. The salient features of this system are its wide concentration range, low detection limit, small sample volume requirement (50 μL), and the need for a short measurement time of 15 min, making it a prospective candidate for practical use in point of care analysis.

Microfluidic platform with integrated GMR sensors for quantification of cancer cells

2017 ◽  
Vol 241 ◽  
pp. 438-445 ◽  
Author(s):  
Georgios Kokkinis ◽  
Susana Cardoso ◽  
Franz Keplinger ◽  
Ioanna Giouroudi
Keyword(s):  
Cancer Cells ◽  
Microfluidic Platform ◽  
Gmr Sensors

Giant Magnetoresistance (GMR) Sensors

2013 ◽  
Author(s):  
Candid Reig ◽  
Susana Cardoso ◽  
Subhas Chandra Mukhopadhyay
Keyword(s):  
Giant Magnetoresistance ◽  
Gmr Sensors

Large magnetoresistance in Heusler alloy-based CPP-GMR Sensors

2021 ◽  
Author(s):  
Nattaya Saenphum ◽  
Jessada Chureemart ◽  
Richard F L Evans ◽  
Roy W Chantrell ◽  
Phanwadee Chureemart
Keyword(s):  
Heusler Alloy ◽  
Gmr Sensors

The Limit of Detection of Giant Magnetoresistive (GMR) Sensors for Bio-applications

2009 ◽  
Vol 55 (1) ◽  
pp. 193-196 ◽  
Author(s):  
Kisu Lee ◽  
Seungkyo Lee ◽  
B.K. Cho ◽  
Kwang-Seok Kim ◽  
Byungchul Kim
Keyword(s):  
Limit Of Detection ◽  
Gmr Sensors

Selected Material Aspects of GMR-Sensors used in Hard Disk Drives

2006 ◽  
pp. 14-18
Author(s):  
Jan Marien ◽  
C. Schug ◽  
C. Waldenmaier ◽  
H.-R. Blank
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Gmr Sensors
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