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Nanogranular soft magnetic material ...

Li, Liangliang.

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Nanogranular soft magnetic material and on-package integrated inductors.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Nanogranular soft magnetic material and on-package integrated inductors./
Author:	Li, Liangliang.
Description:	132 p.
Notes:	Adviser: Shan X. Wang.
Contained By:	Dissertation Abstracts International68-06B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3267563
ISBN:	9780549062981

Nanogranular soft magnetic material and on-package integrated inductors.
Li, Liangliang.

Nanogranular soft magnetic material and on-package integrated inductors. - 132 p.

Adviser: Shan X. Wang.

Thesis (Ph.D.)--Stanford University, 2007.

Integrated inductors used in electronic circuits are mainly spiral-shaped aluminum devices fabricated on Si chip. They have several disadvantages---large silicon area consumption, high DC resistance and high cost. An attractive approach to address these issues is directly integrating inductors into package substrates, which provide plenty of usage area, low resistance and low cost. The goals of this dissertation are designing and fabricating magnetic and air-core inductors with characteristic low resistance and high quality factor on package substrates. The research work includes three parts which are summarized below.

ISBN: 9780549062981Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Nanogranular soft magnetic material and on-package integrated inductors.
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020 $a 9780549062981
035 $a (UMI)AAI3267563
035 $a AAI3267563
040 $a UMI $c UMI
100 1 $a Li, Liangliang. $3 1272547
245 1 0 $a Nanogranular soft magnetic material and on-package integrated inductors.
300 $a 132 p.
500 $a Adviser: Shan X. Wang.
500 $a Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 4069.
502 $a Thesis (Ph.D.)--Stanford University, 2007.
520 $a Integrated inductors used in electronic circuits are mainly spiral-shaped aluminum devices fabricated on Si chip. They have several disadvantages---large silicon area consumption, high DC resistance and high cost. An attractive approach to address these issues is directly integrating inductors into package substrates, which provide plenty of usage area, low resistance and low cost. The goals of this dissertation are designing and fabricating magnetic and air-core inductors with characteristic low resistance and high quality factor on package substrates. The research work includes three parts which are summarized below.
520 $a First, the CoFeHfO nanogranular magnetic material developed on Si wafers and package substrates by pulsed DC reactive sputtering were investigated. On Si wafers, the optimized CoFeHfO film has soft magnetic properties. On printed circuit board (PCB) substrates, these magnetic properties degrade due to the rough surface. Surface planarization such as chemical-mechanical polishing can be applied on PCB substrates to reduce the surface roughness and hence improve these properties.
520 $a Second, on-package inductors with small resistances and high quality factors were designed, fabricated, measured and analyzed. Air-core and magnetic inductors (20 design variations) were built on 8-inch PCB substrates. The DC resistances of these inductors are less than 12 mO, one of the lowest values ever reported. The maximum quality factors can be as large as &sim;80 at around 1 GHz for the air-core inductors and &sim;25 at 200 MHz for the magnetic inductors.
520 $a Third, inductor simulation was carried out to study the effects of magnetic materials on the properties of inductors using the Ansoft HFSS software package. The measurement data for the permeability spectra of the CoFeHfO film and the tensor nature of the permeability were taken into account in the simulation. The simulation results matched the experimental data for the inductances, resistances and quality factors. This established an accurate method for modeling high-frequency magnetic devices. Using this method, an inductor with a closed magnetic core was studied by varying the geometry of the core and copper coil. It has been found that the inductance of this inductor depends strongly on whether the permeability of the magnetic core is isotropic or anisotropic.
590 $a School code: 0212.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0544
690 $a 0794
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 68-06B.
790 $a 0212
790 1 0 $a Wang, Shan X., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3267563