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Constricted current perpendicular to...

Huang, Xiaobo.

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Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating./
Author:	Huang, Xiaobo.
Description:	142 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: .
Contained By:	Dissertation Abstracts International72-04B.
Subject:	Engineering, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3443272
ISBN:	9781124480336

Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating.
Huang, Xiaobo.

Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating. - 142 p.

Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: .

Thesis (Ph.D.)--University of Minnesota, 2011.

Electrochemically deposited magnetic nanowires have gained increasing attention since current perpendicular to the plane giant magnetoresistance (CPP-GMR) was observed in multilayered nanowires. Magnetic nanowires have potential for fundamental studies, including measuring spin diffusion lengths and understanding the mechanisms of the electron spin transfer. They also have great potential technological applications as CPP-GMR sensors, magnetic random access memory (MRAM), and next generation magnetic recording heads. Small diameter nanowires are desired in order to have large current density per device and a high areal density for device arrays, for example, 2 Tb/in2 media. In this research, E-beam lithography, nano-imprinting, and self-assembled nanoporous alumina templates (AAO) were studied to achieve as small diameter nanopores as possible. AAO templates with 10 nm diameter were fabricated using both Al foils and Al thin films. Very small diameter (10 nm) CPP-GMR Co/Cu nanowires were fabricated into AAO templates using electrochemical deposition. The magnetic transport properties of these multilayered and trilayered Co/Cu nanowires were investigated. It was found that nanowire anisotropies parallel and perpendicular to the nanowires were dependent on the thicknesses of Co and Cu layers. GMR of 19% was achieved with 10 nm diameter nanowires at room temperature. The magnetic free layers were as thin as 4.5 nm with GMR of 18%. Spin transfer torque switching current densities were measured to be 10 6 -- 108A/cm2. The measurement of spin transfer torque was conducted numerous times with high repeatability in the critical switching currents from parallel to antiparallel alignment (JP-AP) and slight variations in back (JAP-P). Small resistance area products (RA) of 0.003 Omum2 were achieved with trilayers that had 40O total resistance. All of results in this study show that nanowires with 10 nm diameters have potential application as next generation CCP-GMR sensors and spin transfer torque MRAM.

ISBN: 9781124480336Subjects--Topical Terms:

1020744
Engineering, General.

Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating.
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020 $a 9781124480336
035 $a (UMI)AAI3443272
035 $a AAI3443272
040 $a UMI $c UMI
100 1 $a Huang, Xiaobo. $3 1680639
245 1 0 $a Constricted current perpendicular to plane (CPP) magnetic sensor via electroplating.
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: .
500 $a Adviser: Bethanie J. Hills Stadler.
502 $a Thesis (Ph.D.)--University of Minnesota, 2011.
520 $a Electrochemically deposited magnetic nanowires have gained increasing attention since current perpendicular to the plane giant magnetoresistance (CPP-GMR) was observed in multilayered nanowires. Magnetic nanowires have potential for fundamental studies, including measuring spin diffusion lengths and understanding the mechanisms of the electron spin transfer. They also have great potential technological applications as CPP-GMR sensors, magnetic random access memory (MRAM), and next generation magnetic recording heads. Small diameter nanowires are desired in order to have large current density per device and a high areal density for device arrays, for example, 2 Tb/in2 media. In this research, E-beam lithography, nano-imprinting, and self-assembled nanoporous alumina templates (AAO) were studied to achieve as small diameter nanopores as possible. AAO templates with 10 nm diameter were fabricated using both Al foils and Al thin films. Very small diameter (10 nm) CPP-GMR Co/Cu nanowires were fabricated into AAO templates using electrochemical deposition. The magnetic transport properties of these multilayered and trilayered Co/Cu nanowires were investigated. It was found that nanowire anisotropies parallel and perpendicular to the nanowires were dependent on the thicknesses of Co and Cu layers. GMR of 19% was achieved with 10 nm diameter nanowires at room temperature. The magnetic free layers were as thin as 4.5 nm with GMR of 18%. Spin transfer torque switching current densities were measured to be 10 6 -- 108A/cm2. The measurement of spin transfer torque was conducted numerous times with high repeatability in the critical switching currents from parallel to antiparallel alignment (JP-AP) and slight variations in back (JAP-P). Small resistance area products (RA) of 0.003 Omum2 were achieved with trilayers that had 40O total resistance. All of results in this study show that nanowires with 10 nm diameters have potential application as next generation CCP-GMR sensors and spin transfer torque MRAM.
590 $a School code: 0130.
650 4 $a Engineering, General. $3 1020744
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0537
690 $a 0607
710 2 $a University of Minnesota. $b Electrical Engineering. $3 1018776
773 0 $t Dissertation Abstracts International $g 72-04B.
790 1 0 $a Stadler, Bethanie J. Hills, $e advisor
790 1 0 $a Campbell, Stephen A. $e committee member
790 1 0 $a Stadler, Bethanie J. Hills $e committee member
790 1 0 $a Franklin, Rhonda $e committee member
790 1 0 $a Cui, Tianhong $e committee member
790 $a 0130
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3443272