MAGNETIC TUNNELING JUNCTION DEVICE, MEMORY DEVICE INCLUDING THE SAME, AND METHOD OF MANUFACTURING THE MAGNETIC TUNNELING JUNCTION DEVICE

Smart overview of the Invention

The patent application discusses a novel magnetic tunneling junction (MTJ) device, which includes a first and second magnetic layer separated by an oxide layer. The oxide layer is composed of a metal oxide with a stoichiometrically oxygen-deficient composition. The second magnetic layer is doped with a metal element, enhancing its magnetic properties. This innovative structure is designed to improve the performance of memory devices, such as magnetic random access memory (MRAM).

Technical Details

The MTJ device's oxide layer is structured into two regions: one adjacent to the first magnetic layer and another adjacent to the second magnetic layer. The proportion of elements like oxygen or nitrogen is greater in the second region. Additionally, a metal layer may be included between these regions, with its thickness ranging from about 2 Å to 3 Å. The metal material used in this layer is consistent with that of the metal oxide.

Applications in Memory Devices

Incorporating the MTJ device into memory devices allows for efficient data storage through resistance changes. This technology is particularly beneficial for MRAM, offering advantages like non-volatility, high-speed operation, and durability. The MTJ device's resistance varies based on the magnetization direction of its layers, enabling it to represent binary data states efficiently.

Manufacturing Method

The manufacturing process involves preparing the oxide layer, cooling it to a specific temperature range, and then depositing a wetting layer with a magnetic material. The wetting layer is oxidized or nitrided, followed by the deposition of a magnetic layer doped with a metal element. The process concludes with annealing to enhance the layer's properties. This method ensures the oxide layer maintains its stoichiometrically oxygen-deficient composition.

Potential Enhancements

The patent outlines potential improvements like additional oxide layers and magnetic layers to further enhance device performance. The MTJ device design and manufacturing process aim to achieve faster operation speeds and improved data retention, making it a promising component for future memory technologies. The described embodiments and variations offer flexibility in adapting the technology to various applications.