Variable-Frequency Magnetoresistive Element Voltage Control
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Solution Overview
Problem
Existing variable-frequency control mechanisms for magnetoresistive effect elements in high-frequency devices face challenges in maintaining stable magnetic or electric fields without energy consumption, leading to increased operation energy and space requirements, particularly when using electromagnets for magnetic field generation.
Innovation Solution
A variable-frequency magnetoresistive effect element that utilizes an electric field to control spin precession frequency, consuming minimal energy and maintaining the frequency-varied state without continuous electric field application, combined with a magnetic field for simultaneous frequency control, using antiferromagnetic or ferrimagnetic materials with magnetoelectric effects and a control mechanism for voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electromagnet is used to generate a magnetic field for frequency control, then the oscillation frequency can be controlled by varying the current, but the operation energy is greatly increased and the assigned space increases greatly
Solution Approach 1:
The patent replaces the electromagnet-based magnetic field generation system with a magnetoelectric effect-based system. Instead of using electrical current through a coil to generate a magnetic field, the invention applies an electric field directly to a magnetoresistive effect element containing antiferromagnetic or ferrimagnetic material, which generates the necessary magnetic field through the magnetoelectric effect. This substitution eliminates the need for continuous current flow through a coil, dramatically reducing operation energy consumption while maintaining frequency control capability.
Solution Approach 2:
The patent changes the control parameter from current (in electromagnet) to voltage (in magnetoelectric system). By varying the voltage applied to the magnetoresistive effect element, the electric field strength is controlled, which in turn controls the magnetic field strength and thus the oscillation frequency. This parameter change enables more efficient energy utilization and reduces continuous power consumption.
2Adaptability or versatility
If an electromagnet is used to generate a magnetic field for frequency control, then the oscillation frequency can be controlled, but the assigned space increases greatly
Solution Approach 1:
The patent merges the magnetic field generation function and the frequency control function into a single integrated magnetoresistive effect element. The magnetoresistive effect element contains both the magnetic field generating mechanism (through magnetoelectric effect) and the oscillation control functionality. This integration eliminates the need for a separate electromagnet and its associated coil structure, dramatically reducing the assigned space while maintaining full frequency control capability.
Solution Approach 2:
The magnetoresistive effect element serves multiple functions simultaneously: it generates the magnetic field through the magnetoelectric effect, controls the oscillation frequency through voltage application, and provides the oscillation output. This multi-functionality consolidates what would traditionally require separate components (electromagnet, oscillator, frequency control mechanism) into a single compact device.
3Adaptability or versatility
If magnetic-field-based control scheme is used with electromagnet, then frequency control is achieved, but current must be continuously passed through the coil to maintain excited state
Solution Approach 1:
The patent employs periodic or pulsed voltage application to the magnetoresistive effect element rather than continuous current flow. The voltage is applied in cycles to maintain the oscillation and frequency control, allowing the system to enter low-power states between pulses. This periodic action maintains the necessary magnetic field and oscillation state while dramatically reducing the duration of active energy consumption compared to continuous electromagnet operation.
Solution Approach 2:
The magnetoresistive effect element generates its own magnetic field through the magnetoelectric effect when voltage is applied, eliminating the need for external continuous current supply through a coil. The element serves itself by converting electrical energy directly into the magnetic field needed for oscillation control, reducing the burden of continuous external power delivery and maintaining excited state more efficiently.
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
The solution enables stable frequency control with significantly reduced energy consumption and space requirements, allowing for efficient operation in devices like oscillators, detectors, and filters by varying the voltage applied to the magnetoresistive effect element.
Implementation Method 1
a variable-frequency magnetoresistive effect element that uses the magnetoresistive effect
Implementation Method 2
The magnetoresistive effect element contains an antiferromagnetic material or ferrimagnetic material having a magnetoelectric effect
Data Source
AI summary
A variable-frequency magnetoresistive effect element includes a magnetoresistive effect element, a magnetic-field applying mechanism that applies a magnetic field to the magnetoresistive effect element, an electric-field applying mechanism that applies an electric field to the magnetoresistive effect element, and a control terminal connected to the electric-field applying mechanism and used for applying a voltage that varies in at least one of magnitude and polarity to the electric-field applying mechanism. The magnetoresistive effect element contains an antiferromagnetic material or ferrimagnetic material having a magnetoelectric effect. A spin torque oscillation frequency or spin torque resonance frequency of the magnetoresistive effect element is controlled by varying the voltage applied via the control terminal in at least one of magnitude and polarity.