|Posted on March 30, 2016 at 10:45 AM|
Magnetic metamaterials are engineered materials designed to interact with electromagnetic radiation in a way that natural ones do not. These materials offer special versatility in creating novel device architectures through controlled propagation of electromagnetic radiation and spin waves. Prof. Elisa Riedo of CUNY’s Advanced Science Research Center (ASRC), in collaboration with Prof. Riccardo Bertacco at the Politecnico of Milan, Italy, have recently developed a new technology to make nano-patterns with re-programmable properties without affecting either the chemistry or the topography of the magnetic metaparticles. This discovery can help us to control magnetism down to the nano level and can find interesting new applications in spintronics, a new form of electronics that does not utilize the movement of charges but instead the magnetic properties of a material. Read more here.
(Dr. Aruta (left) and Dr. Riedo (right) posing in front of a poster describing the use of TCNL for nanoelectronics applications with 2D materials and functionalized graphene.)
Conventionally, these materials are fabricated using lithography or ion radiation. But these methods are mostly irreversible and offer only limited control over the magnetic properties. What’s new about Prof. Riedo’s and her co-workers’ method is that they have employed a technique called ‘thermally assisted magnetic scanning probe lithography’ (tam-SPL) which works on the principle of local heating and cooling a ferromagnetic layer by bringing it in contact with the hot tip of a scanning probe microscope (SPM) in the presence of a magnetic field. The hot tip is then used to align the spins in the material in any desired direction. Riedo says: "The same pattern can be written and reset many times, with the resolution and versatility of SPL….this work is gaining momentum as a key nanofabrication method for the next generation of nano-devices, from biomedical sensing to sprintronics."
Riedo moved from Georgia Tech to ASRC as part of their Nanoscience Initiative in August 2015. She is widely recognized for her pioneering work in thermochemical nanolithography. She is also interested in liquids confined in nano-space and understanding the nano-mechanics of materials from nanotubes to DNA. She is a fellow of the American Physical Society.
Thermochemical nanolithography (TCNL) apparatus used to make nanoscale patterns of magnetic domains. The system consists of a scanning probe microscope adapted to perform TCNL, sitting on top of an inverted optical microscope connected to a Raman spectrometer. The system is located in the Nanoscience Advanced Science Research Center of the City University of New York (CUNY).
Behind the system from left to right: Dr. Annalisa Calò, a post-doctoral fellow in Riedo's group, Dr. Carmela Aruta, a visiting professor from the CNR-SPIN (National Research Council-Institute for Superconductors and Innovative Materials and Devices) in Italy, and Professor Elisa Riedo who is the director of the PicoForce Lab where the experiments where performed.
- Written by Nakita Sengar, edited by Paulette Clancy
(Photo credit: Provided by and used with permission from Prof. Elisa Riedo.)