Multiferroic Element Initialization via Phase Transition
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Solution Overview
Problem
Conventional methods for suppressing electron scattering in electronic devices are inefficient at room temperature, leading to energy loss and instability in multiferroic elements, which are essential for stable operation.
Innovation Solution
A method for initializing multiferroic elements by applying an electric field or magnetic field to the superlattice structure above the phase transition temperature, ensuring that the first and second set phases are unified, thereby suppressing electric dipole cancellation and enhancing electric polarization and ferromagnetism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to suppress electron scattering, then electron scattering is reduced, but energy loss increases and device stability deteriorates at room temperature
Solution Approach 1:
The invention changes the physical state of the second alloy layer by controlling phase transition temperature through compositional parameters (x value in M1-xTex). By adjusting the phase transition temperature to be near room temperature, the material exhibits enhanced electric polarization and ferromagnetism without requiring extreme cooling, thus reducing energy loss while improving device stability.
Solution Approach 2:
The invention uses a composite laminated structure combining first alloy layers (antimony-tellurium, bismuth-tellurium, or bismuth-selenium) with second alloy layers (germanium-tellurium, aluminum-tellurium, or silicon-tellurium). This composite structure leverages the complementary properties of different materials to achieve both low electron scattering and stable operation at room temperature.
2Reliability
If phase transition is utilized to enhance electric polarization, then device performance improves, but phase transition temperature control becomes critical
Solution Approach 1:
The invention provides a direct relationship between compositional parameter x and phase transition temperature. By selecting specific x values (0.5 ≤ x < 1.0), the phase transition temperature can be precisely controlled to occur near room temperature, eliminating the need for complex temperature control systems during manufacturing and operation.
3Reliability
If multiferroic elements are operated without initialization, then device complexity is reduced, but operation stability deteriorates due to phase transition instability
Solution Approach 1:
The invention incorporates an initialization process that is performed once during device fabrication or activation. This preliminary action sets the first and second set phases in a unified state, ensuring stable operation throughout the device lifetime without requiring continuous initialization, thus adding minimal complexity while achieving reliable operation stability.
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 approach stabilizes the operation of multiferroic elements by ensuring significant electric polarization and ferromagnetism, allowing for efficient phase transition between reset and set phases, thereby reducing energy loss and improving device performance.
Implementation Method 1
by this effect of electrons (a spin-orbit interaction), an energy term of a spin-orbit interaction is added to the Hamiltonian of a band structure formed by the electrons
Implementation Method 2
explained based on a relativistic effect that occurs due to the relativistic velocity close to light of inner-shell electrons of a relatively heavy chemical element
Implementation Method 3
a magnetic moment is generated when an electric field is applied thereto and an electric field is generated when a magnetic field is applied thereto
Data Source
AI summary
A method of initializing a multiferroic element for obtaining a stable element operation includes applying at least one selected from a group consisting of an electric field and a magnetic field to the multiferroic element under a temperature condition equal to or higher than a phase transition temperature. The multiferroic element has a laminated structural body including a first alloy layer and a second alloy layer. The first alloy layer is formed by using any of antimony-tellurium, bismuth-tellurium and bismuth-selenium as a principal component. The second alloy layer is laminated on the first alloy layer, and formed by using a compound represented by the following general formula (1) as a principal component. The second alloy layer is configured to undergo phase transition between a reset phase and a set phase. Electric polarization is not caused in the reset phase, but caused in the set phase. The second alloy layer undergoes the phase transition from the reset phase to the set phase at the phase transition temperature.[Chemical Formula 1]M1-xTex (1)Here, in the above-mentioned general formula (1), M represents an atom of any of germanium, aluminum and silicon, and x represents a numerical value of 0.5 or more and lower than 1.