Magnetic Storage Device with Joule Heating for Low Power MRAM

The patent applies thermal field assistance by temporarily increasing the temperature of the storage layer during writing operations. This parameter change reduces the magnetization stability transiently, enabling easier magnetization inversion with lower current. The heat generation layer is activated only during writing to modify the energy barrier, while reading operations proceed at normal temperature to maintain high stability and low power consumption.

The heat generation layer operates periodically only during writing operations rather than continuously. This periodic activation provides thermal assistance exactly when needed for magnetization inversion, while allowing the system to maintain high stability during reading and idle periods, thus resolving the tradeoff between retention and power consumption.

The heat generation layer is positioned adjacent to the storage layer to provide localized thermal assistance only where needed for magnetization inversion. This localized heating approach ensures that thermal energy is concentrated at the MTJ device during writing, while surrounding structures and the storage medium experience minimal thermal exposure, thus protecting magnetic anisotropy from heat-induced degradation.

The thermal assistance is applied as a brief pulse during the writing operation rather than sustained heating. This short-duration thermal stimulus is sufficient to reduce the energy barrier for magnetization switching, but the rapid cessation of heating prevents excessive thermal exposure that could damage the magnetic anisotropy or surrounding structures.