Inside QNS: Introducing STM Eve

Welcome Inside QNS! Meet EVE – our third ESR-STM system completed in August 2021. Eve is completely home-built and is based on a continuous circulation of helium gas for cooling below 5 K. We are currently operating Eve with 4He gas for circulation and we reach 1.3 K in continuous circulation and 1.0 K in single-shot mode. Switching between these modes simply requires opening and closing one valve and can be done while tunneling. We expect to reach 0.6 K in continuous circulation when we transition to the expensive 3He isotope. With the departure of Eve group leader and PI Yujeong Bae in January 2024, we decided to train a new generation of postdocs and students on the details, and at the same time upgrade the system from an STM to a combined STM/AFM system. To the best of our knowledge, there are very few AFM systems that operate in high magnetic fields and low-temperatures (the most prominent at NIST in the USA). The conversion was difficult but successful and we are working on measuring the magnetic exchange force between a single spin on the surface and a magnetic AFM tip. Eve has been a workhorse for exploration of Spins on Surfaces. Watch QNS alumni Yujeong Bae introduce Eve! Don't miss out on STM'25 – where the new era of STM begins, happening right here in Seoul, Korea in Ewha Campus, June 23-27 2025! With nearly 40 invited speakers and experts in STM will join the conference next week, it's about time we bring the community back together under one roof –see you there! https://stm25.org/ Website: https://qns.science/ Social Media: @qns.science