Tuning exchange interactions in organometallic semiconductors

Naveen Rawat; Lane W. Manning; Kim-Ngan Hua; Randall L. Headrick; Judy G. Cherian; Michael M. Bishop; Stephen A. McGill; Madalina I. Furis

doi:10.1117/12.2186442

8 September 2015 Tuning exchange interactions in organometallic semiconductors

Naveen Rawat, Lane W. Manning, Kim-Ngan Hua, Randall L. Headrick, Judy G. Cherian, Michael M. Bishop, Stephen A. McGill, Madalina I. Furis

Author Affiliations +

Proceedings Volume 9551, Spintronics VIII; 95512R (2015) https://doi.org/10.1117/12.2186442
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Organic semiconductors are emerging as a leading area of research as they are expected to overcome limitations of inorganic semiconductor devices for certain applications where low cost manufacturing, device transparency in the visible range or mechanical flexibility are more important than fast switching times. Solution processing methods produce thin films with millimeter sized crystalline grains at very low cost manufacturing prices, ideally suited for optical spectroscopy investigations of long range many-body effects in organic systems. To this end, we synthesized an entire family of organosoluble 3-d transition metal Pc’s and successfully employed a novel solution-based pen-writing deposition technique to fabricate long range ordered thin films of mixtures of metal-free (H₂Pc) molecule and organometallic phthalocyanines (MPc's). Our previous studies on the parent MPc crystalline thin films identified different electronic states mediating exchange interactions in these materials. This understanding of spin-dependent exchange interaction between delocalized π-electrons with unpaired d spins enabled the further tuning of these interactions by mixing CoPc and H₂Pc in different ratios ranging from 1:1 to 1000:1 H₂Pc:MPc. The magnitude of the exchange is also tunable as a function of the average distance between unpaired spins in these materials. Furthermore, high magnetic field (B < 25T) MCD and magneto-photoluminescence show evidence of spin-polarized band-edge excitons in the same materials.

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Naveen Rawat, Lane W. Manning, Kim-Ngan Hua, Randall L. Headrick, Judy G. Cherian, Michael M. Bishop, Stephen A. McGill, and Madalina I. Furis "Tuning exchange interactions in organometallic semiconductors", Proc. SPIE 9551, Spintronics VIII, 95512R (8 September 2015); https://doi.org/10.1117/12.2186442

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KEYWORDS

Magnetism

Thin films

Crystals

Electrons

Metals

Molecules

Absorbance

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