Magnetic Memory Write Current Control via Temperature-Dependent Coercive Force
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Solution Overview
Problem
Existing magnetic memory technologies face inefficiencies in data writing due to temperature-dependent coercive force changes, requiring separate temperature measurement elements that complicate the structure and integration of memory elements.
Innovation Solution
A magnetic memory design that incorporates a conductive portion laminated on a magnetoresistance element, allowing temperature changes to be measured through resistance value changes, and a control portion to adjust current application based on predetermined conditions, using theories like self-consistently renormalized spin fluctuation and thermal agitation to compensate for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate temperature sensor element is provided to measure temperature for compensating coercive force changes, then temperature compensation capability is improved, but device complexity and integration are worsened
Solution Approach 1:
The patent combines the temperature measurement function with the existing magnetoresistance element by laminating a conductive portion on it. The conductive portion's resistance changes with temperature, allowing temperature measurement without requiring a separate temperature sensor element. This merging approach maintains temperature compensation capability while reducing device complexity and improving integration.
Solution Approach 2:
The magnetoresistance element serves dual functions: it acts as both the memory element and the temperature sensor. The conductive portion laminated on the magnetoresistance element provides temperature-dependent resistance changes that enable temperature measurement. This multi-functionality eliminates the need for dedicated temperature sensing components while maintaining accurate temperature compensation.
2Reliability
If write current is increased to ensure data writing at low temperatures where coercive force is high, then write capability at low temperature is improved, but energy consumption and potential damage at high temperatures are worsened
Solution Approach 1:
The patent implements dynamic adjustment of write current based on real-time temperature measurement. The control portion modifies the write current magnitude according to the measured temperature: higher currents are applied at low temperatures where coercive force is high, while lower currents are used at high temperatures where coercive force is low. This dynamic adaptation ensures reliable writing across the temperature range while optimizing energy consumption and preventing damage.
Solution Approach 2:
The system changes the write current parameter based on temperature conditions. By measuring temperature through the conductive portion's resistance and adjusting the write current accordingly, the system adapts the electrical parameter to match the magnetic properties of the ferromagnetic layer at different temperatures, ensuring efficient and safe operation.
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 enables efficient temperature compensation without additional measurement elements, enhancing integration and write efficiency across various temperature ranges.
Implementation Method 1
a temperature change of the magnetoresistance element can be determined based on a change in the resistance value of the conductive portion
Implementation Method 2
tunnel magnetoresistance (TMR) elements using an insulating layer (a tunnel barrier layer or a barrier layer) as a non-magnetic layer
Implementation Method 3
it is known that the coercive force of a ferromagnetic layer depends on the temperature of the ferromagnetic layer. As the temperature of a ferromagnetic layer increases, the coercive force of a ferromagnetic body decreases
Data Source
AI summary
A magnetic memory includes: a magnetoresistance element; a conductive portion that is laminated on the magnetoresistance element; and a control portion configured to determine a driving temperature of the magnetoresistance element based on a change in a resistance value of the conductive portion and to control the amount of current applied to the magnetoresistance element.