Green Memory: How Nickel Could Unlock the Future of Sustainable AI

The Power Hunger of the Digital Age

The AI revolution is here, but it comes with a hidden cost: a massive surge in energy consumption. As our world becomes increasingly data-driven, the semiconductor industry is under immense pressure to find “green” storage solutions. Enter MRAM (Magnetoresistive Random-Access Memory). Unlike traditional memory (DRAM) that forgets data the moment power is cut, MRAM is “non-volatile” – it holds onto information without needing a constant stream of electricity. However, today’s MRAM faces a sustainability hurdle. It relies heavily on Platinum (Pt), one of the rarest and most carbon-intensive metals on Earth. With 85% of the world’s Platinum coming from just two countries (South Africa and Russia), Europe’s tech independence is at risk. Through the NICKEFFECT project, scientists at Singulus Technologies, in collaboration with the Universitat Autònoma de Barcelona and AGH University Krakow, have achieved a breakthrough: replacing critical Platinum with affordable, abundant Nickel. This shift isn’t just about cost – it’s about establishing a truly “Green Memory” for the future.

The Challenge: Engineering at the Atomic Scale

Inside an MRAM cell, the magic happens through spintronics. Instead of just moving electrons around based on their charge, spintronics uses their “spin”- a tiny magnetic property. This allows devices to read and write data with incredible energy efficiency. However, building these cells is like constructing a 30-story skyscraper where each floor is only a few atoms thick (0.15 to 3nm). In standard designs, up to 10 of these layers are made of Platinum. Platinum is essential because it provides the “magnetic hardness” needed to keep data stable. The challenge for the NICKEFFECT team was clear: Can we swap Platinum for Nickel without losing the performance that makes MRAM so fast and reliable?

The NICKEFFECT Solution: The Power of the Tunnel

At the heart of an MRAM element is the Magnetic Tunnel Junction (MTJ). Imagine two magnetic layers separated by an ultra-thin insulator.

• If the magnets point the same way (Parallel), electricity flows easily—representing a binary “0”.
• If they point in opposite directions (Antiparallel), the flow is restricted—representing a “1”.

To keep this system stable, researchers use a “Synthetic Antiferromagnet” (SAF) to act as a magnetic anchor. Traditionally, two-thirds of this anchor is Platinum. The NICKEFFECT team successfully re-engineered this anchor using 100% Nickel-based layers. To build these atomic sandwiches, Singulus Technologies utilized their TIMARIS production platform. This high-tech vacuum chamber uses “Physical Vapor Deposition” (PVD)—essentially a plasma-powered “atomic spray paint”—to deposit layers with sub-Angstrom precision. This ensures that every layer is perfectly uniform across a massive 300mm silicon wafer.

Testing & Validation: Better Than the Best

The transition from Platinum to Nickel wasn’t overnight. The team conducted over 400 experimental trials to fine-tune the interplay between 34 distinct layers. The results were staggering:

• Heat Resistance: The new Nickel-based stacks remained stable up to 370°C, exceeding the standard required for industrial chip manufacturing.
• Data Integrity: The “Tunnel Magneto Resistance” (TMR)—a key measure of how clearly the memory can be read—reached 140%, significantly exceeding the project’s original goals.

To prove it worked in the real world, the team at AGH University Krakow carved these layers into tiny “nanopillars” just 80nm wide (about 1,000 times thinner than a human hair). These prototype cells were switched back and forth 100 million times without failure. Even better, the Nickel-based cells required 75% less switching current than conventional Platinum cells, making them even more energy-efficient than the current industry benchmark.

Impact: A Resilient, Greener Europe

The success of Use-Case 3 proves that we don’t have to choose between high performance and environmental responsibility. By eliminating Platinum, NICKEFFECT has paved the way for memory that is cheaper to produce, more resilient to supply chain shocks, and kinder to the planet. “With this development, we are helping the industry become more resilient against critical raw material shortages,” says Dr. Jürgen Langer, lead scientist at Singulus Technologies. “The beauty of this solution is how easily it can be adapted into existing factories. Nickel-based MRAM is the low-power, green storage technology of the future.” As AI continues to grow, the memory keeping it alive is now one step closer to being sustainable.