Dr. Moodera: Towards Molecular Spintronics: Data Storage and Manipulations [APhys Lecture]

Tuesday, June 12, 2018 at 11:45am to 1:00pm


APhys presents a lecture by Dr. Moodera, Senior Research Scientist, MIT Physics.

Towards Molecular Spintronics: Data Storage and Manipulations

Information storage bit size and computing is inching towards molecular level. Spin transport in organic semiconductors (OS) has the potential in realizing this goal in a straightforward way. The charge and spin transport at OS and ferromagnetic metal interface, although complex, has the needed capabilities and potential for achieving molecular level spintronics. The OS/ferromagnetic (FM) metal interfaces constitute a rich and unique opportunity to exploit the fundamental physical interactions on a molecular level. The organic molecules, atomically precise nanoscopic electronic units, over a FM surface present tunable and limitless interaction possibilities.  The interface engineering allows one to tune the exchange interaction to realize the richness of interface phenomena in addition with realistic potential to lead us towards designing “on demand” molecular spintronics.

Spin tunneling through a few monolayers of some planar OS molecules (molecules look like graphene fragments) show induced FM and spin filter behavior with a large induced surface anisotropy. Our experimental results along with density functional calculations describe these molecules as templates on ferromagnetic surface to control the interface chemistry, magnetism and exchange coupling required for the stability and manipulation of information stored in individual molecules. We envision a highly scalable room-temperature non-volatile molecular memory device with integrated read & write capabilities. This interface magnetoresistance phenomenon with just a single FM layer in conjunction with OS molecules can provide novel schemes for performing read/write operations. The molecular ‘bit’ not only stores information, but also serves as a sensor - an integrated storage-sensing system with densities that may possibly reach 1000 Tbits/sq.  Moreover these molecules and their coupling may be stimulated by electric, optic etc. means and thus could be used to represent quantum states as spin qubits.

Food will be provided.

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