Page 19 - CFM_Newsletter_CY22

Expert Lectures

It is always interesting and educational to talk about science. To encourage conversation on various research issues,
we invite experts to connect virtually with our scholars and faculty members once a month. These virtual seminars
infused deeper thinking, questioning, and understanding of their research problems among the research scholar and
made them realize to correlate their findings with the real world. Here we include some of the highlights of virtual
seminars.

Development of high-functional multiferroic thin films and their device application

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Satoru Yoshimura, Akita University, Japan, January 31
We were fortunate to begin our seminar series with Satoru Yoshimura, Professor
& Director, Research Centre of Advanced Materials for Breakthrough
Technology, Graduate School of Engineering Science, Akita University, Japan.
He spoke about the magnetic reversal method using an electric field. Ba, La, or
Co doped BiFeO3 were reported as multiferroic material with clear ferromagnetic
hysteresis. Since, the magnetic properties of BiFeO3-based thin films are not
sufficient for application to that magnetic device, they studied the substitution of
various Lanthanoids against Bi and/or various concentration of Co against Fe in
BiFeO3. And he reported in (Bi0.5La0.5) (Fe0.75Co0.25)O3 film, magnetic domain
with several hundred nano-meter size was generated by applying local electric
field without applying magnetic field. Such investigations have led to the
conclusion that the multiferroic films are expected to be useful for electric-field-driven magnetic devices.

Permanent magnets a challenge of size, shape, and orientation

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Dr. Mogens Christensen, Aarhus University, Denmark, February 3
Dr. Mogens Christensen, Professor Centre for Integrated Materials Research
(iMAT) Department of Chemistry & iNANO Aarhus University, Denmark,
delivered a talk on permanent magnets. Magnetic materials are omnipresent in
our daily life's, ranging from electromotors and generators converting between
kinetic energy and electricity to hard drive data storage. Magnetism is a quantum
mechanical phenomenon related to the number of unpaired electrons on the
atomic level. The talk was based on the importance of understanding and
controlling structures from the atomic via the nanoscale to the microscopic level
allows the design and building of better performing magnetic materials. The role
of Synchrotron light and Neutron scattering for investigating the compaction and alignment of permanent
magnetic material on a sub-second time scale and for obtaining information about the atomic dipolar
magnetic moment on the atomic level was discussed. He concluded that the main scope was to utilise the
obtained information to improve the processes and enhance the performance of magnetic materials.

CFM Newsletter Jan. – Dec. 2022 19 Vol – 2