Dissertation: Magnetic Memory with All-Organic Compounds? (Toivola)
The doctoral research of Juho Toivola concerns organic radicals that are diamagnetic in solid state, turning paramagnetic upon melting. When these molten radicals are cooled, they exhibit supercooling, a phenomenon where the material can exist as either solid or liquid at the same temperature range, depending on its thermal history. In conjunction with the change in magnetic state, this property constitutes a form of magnetic memory.
- Current applications of magnetic memory cover high technology devices such as hard disk drives. In contrast to contemporary devices, organic radicals enable an entirely different mechanism that could pave the way for novel applications, explains Toivola.
Controlling temperature for managed magnetic memory
Through combinations of radicals it is possible to prepare solid solutions, where crystal structure follows that of its constituents. This allows the fine-tuning of the thermal range where magnetic memory is observed.
Challenging to predict crystal structure
In addition, by crystallizing the radicals together with a metal complex, a co-crystal can be formed, where the properties of both components fuse together.
- Predicting crystal structure from molecular structure alone is difficult, and this research also explored the effects of chemical structure on various polymorphs, as well as the resultant changes in material properties, says Toivola.
M.Sc. Juho Toivola defends his doctoral dissertation "Experimental Insights into the Structural, Thermal, and Magnetic Properties of Stable Organic Radicals” on Friday, 13th of February at 12.00 at Ylistönrinne lecture hall KEM4. Opponent is Professor Dawid Pinkowicz (Jagellonian University) and custos is Assistant Professor Jani Moilanen (University of Jyväskylä).
The thesis "Experimental Insights into the Structural, Thermal, and Magnetic Properties of Stable Organic Radicals” is available in the JYX archive at: https://jyx.jyu.fi/jyx/Record/jyx_123456789_108246
Further information:
- Doctoral Researcher Juho Toivola, jumitoiv@jyu.fi
