Fe-Ga Magnetostrictive Crystal Cutting for Stable Magnetic Strain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetostrictive members made from Fe--Ga alloys exhibit variations in magnetostriction constant and parallel magnetostriction amount, affecting device characteristics despite uniform Ga concentration and crystal orientation.
Innovation Solution
The magnetostrictive member is manufactured by cutting a single crystal of an iron-based alloy to ensure a specific lattice constant orientation in the long-side direction, not exceeding the average of other directions, or minimizing it among those directions, to stabilize the magnetostriction constant and parallel magnetostriction amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single crystal of Fe-Ga alloy is manufactured by conventional methods (Cz method, VB method, or VGF method) with uniform Ga concentration and crystal orientation, then the magnetostriction constant should be uniform, but variations in magnetostriction constant and parallel magnetostriction amount still occur, affecting device characteristics
Solution Approach 1:
The patent applies parameter changes by precisely controlling the lattice constant of the <100> orientation in the long-side direction to be not larger than the average of lattice constants in three directions. This specific parameter control resolves the contradiction by ensuring both uniform magnetostriction constant and consistent device characteristics through targeted lattice constant optimization rather than relying solely on uniform Ga concentration.
2Power
If the crystal orientation is set to <100> for maximum magnetic strain, then the magnetostriction constant is maximized, but the parallel magnetostriction amount varies among members, affecting device performance
Solution Approach 1:
The patent maintains <100> crystal orientation for maximum magnetostriction constant while introducing an additional control parameter: the lattice constant of the <100> orientation in the long-side direction must be not larger than the average of lattice constants in three directions. This dual-parameter approach resolves the contradiction by ensuring both high power output and manufacturing precision through coordinated control of crystal orientation and lattice constant.
3Power
If Fe-Ga alloy with Ga concentration of 18-19 at% or 27-28 at% is used to maximize magnetostriction constant, then the magnetostriction constant reaches maximum, but variations in parallel magnetostriction amount still occur
Solution Approach 1:
The patent accepts Ga concentrations of 18-19 at% or 27-28 at% for maximum magnetostriction constant but adds a critical parameter change: controlling the lattice constant of the <100> orientation in the long-side direction to be not larger than the average of lattice constants in three directions. This resolves the contradiction by layering parameter control, using both compositional parameters (Ga concentration) and structural parameters (lattice constant) to achieve both high power and reliability.
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 manufacturing method results in a magnetostrictive member with high and stable magnetostriction constant and parallel magnetostriction amount, reducing variations among members.
Implementation Method 1
Fe—Ga alloys, which are iron-based alloys, are materials exhibiting the magnetostrictive effect and the reverse magnetostrictive effect, showing a large magnetostriction of about 100 to 350 ppm
Implementation Method 2
the magnetic flux density of the coil wound on the Fe—Ga magnetostrictive member changes due to the reverse magnetostriction effect, and electromagnetic induction electromotive force is generated to generate power
Data Source
AI summary
The magnetostrictive member is formed of a single crystal of an iron-based alloy having magnetostrictive characteristics, is a plate-like body having a long-side direction and a short-side direction, and has a lattice constant of a <100> orientation in the long-side direction not larger than a lattice constant average calculated from lattice constants of <100> orientations in three directions, or the long-side direction, the short-side direction, and a direction orthogonal to the long-side direction and the short-side direction.