Segmented Nanomagnetic Inductor Cores for Low-Loss High-Frequency Stability
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Solution Overview
Problem
Existing nanomagnetic inductor cores restrict magnetic domain dimensions in only one or two directions, limiting their ability to achieve high permeability and frequency stability, as well as increasing energy losses due to domain wall displacement and eddy currents.
Innovation Solution
The development of nanomagnetic inductor cores using segmented nanowires or nanotubes within a porous insulating template, where dielectric material is interposed between segments of high-permeability material, restricting magnetic domain dimensions in all three spatial dimensions, thereby reducing losses and enhancing permeability and frequency stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanomagnetic structures are used instead of micromagnetic structures, then permeability and frequency stability are improved, but manufacturing complexity increases
Solution Approach 1:
The magnetic core is divided into multiple thin magnetic layers separated by non-magnetic spacer layers, creating a segmented nanolaminate structure. This segmentation reduces magnetic domain size and suppresses eddy current losses while maintaining high permeability and frequency stability
Solution Approach 2:
The patent uses composite nanolaminate structures combining magnetic materials (such as Ni, Co, Fe) with non-magnetic spacer materials (such as Cu, Al, SiO2). These composite structures provide both high permeability from the magnetic layers and loss reduction from the non-magnetic spacers
2Loss of energy
If nanowire structures with smaller dimensions are used, then energy losses are reduced, but inductance values decrease
Solution Approach 1:
The patent transitions from one-dimensional nanowires to three-dimensional nanolaminate structures with controlled layer thicknesses and orientations. By stacking multiple thin magnetic layers in the vertical dimension, the structure achieves both low eddy current losses (through thin individual layers) and high inductance (through multiple layers working together)
Solution Approach 2:
The magnetic core is segmented into multiple thin magnetic layers separated by non-magnetic spacer layers, creating a segmented nanolaminate structure. This segmentation reduces magnetic domain size and suppresses eddy current losses while maintaining high permeability and frequency stability
3Ease of manufacture
If homogeneous nanowire structures are used, then fabrication is simplified, but magnetic domain control is insufficient
Solution Approach 1:
The magnetic core is divided into multiple thin magnetic layers separated by non-magnetic spacer layers, creating a segmented nanolaminate structure. This segmentation reduces magnetic domain size and suppresses eddy current losses while maintaining high permeability and frequency stability
Solution Approach 2:
The patent precisely controls the thickness of magnetic layers (typically 10-100 nm) and non-magnetic spacer layers (typically 1-10 nm) to achieve optimal magnetic domain control. By adjusting these dimensional parameters, the structure achieves both low losses and high inductance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in high apparent resistivity, reduced imaginary permeability, and increased ferromagnetic resonance frequency, leading to low hysteretic and eddy current losses, while maintaining low coercivity and high permeability values.
Implementation Method 1
each segment of the high-permeability material has a length, in the axial direction of the nanowire, no greater than a size of a single magnetic domain
Implementation Method 2
there are lower energy losses (e.g. low eddy current losses and low hysteretic losses), notably because when a magnetic field is applied there are no domain walls to undergo displacement
Implementation Method 3
high-permeability material in the pores thereof to constitute elongated nanowires
Implementation Method 4
a segment of dielectric material interposed between adjacent segments of the high-permeability material
Implementation Method 5
Anisotropic, one-dimensional nanostructures based on Ni or Co nanowires are described as having enhanced ferromagnetic resonance (FMR) performance
Implementation Method 6
a porous, electrically-insulating template having high-permeability material in the pores thereof
Data Source
AI summary
A nanomagnetic inductor core that includes: a porous, electrically-insulating template having high-permeability material in the pores thereof to constitute elongated nanowires, and wherein the elongated nanowires are segmented along their axial direction; and a segment of dielectric material interposed between adjacent segments of the high-permeability material along the axial direction of the nanowire; wherein each segment of the high-permeability material has a length, in the axial direction of the nanowire, no greater than a size of a single magnetic domain, and wherein a maximal cross-sectional dimension of the nanowire is no greater than the size of the single magnetic domain. Inductors and LC interposers using such nanomagnetic inductor cores, as well as associated fabrication methods.