ONLINE - Tuning critical exponents via nano-scale materials design
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ONLINE - Tuning critical exponents via nano-scale materials design
CIC nanoGUNE Seminars
- Speaker
-
Lorenzo Fallarino, Nanomagnetism group
- When
-
2021/02/08
12:00
- Place
- nanoGUNE online webinar
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**Tuning critical exponents via nano-scale materials design**
Lorenzo Fallarino
Nanomagnetism Group, CIC nanoGUNE
While nano-scale materials design has been tremendously successful in creating
optimized magnetic and spintronic properties, the ferromagnetic - paramagnetic
phase transition was considered beyond the realm of such efforts. Due to the
universality of phase transitions and associated quantities such as the
critical exponent beta of the order parameter, nano-scale design details were
regarded as irrelevant, which in turn severely limits materials design
capabilities towards the onset of the ferromagnetic order. Here, we
demonstrate that this universality assumption can be overcome by appropriate
nano-scale materials design and that critical exponents can be tuned in an
extremely wide parameter range. Our results reveal that graded magnetic
materials, in which a depth dependent exchange coupling strength follows a
V-shaped profile, exhibit critical scaling behaviour over many orders of
magnitude, but with critical exponents that can be designed and controlled by
their specific nano-scale structures. Specifically, we report the first
experimental observation of M(T) following a power-law behaviour with a la
carte tuneable critical exponents, opening an unexplored design route for any
technology, whose performance is impacted by materials M(T) characteristics,
since beta can now be accessed as a materials design parameter.
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