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Scalable Absolute Magnetometry Using Weakly Spin-Coupled Polaron Pair States

This research presents a cutting-edge absolute magnetometer based on organic spintronics, designed for scalability to micron dimensions with a low-cost framework that minimizes environmental interference. The device utilizes an integrated bipolar MEH-PPV polymer positioned above magnetic field strip lines, allowing for measurement of magnetic fields through spin-dependent current changes during magnetic resonance. The achieved absolute sensitivity of <50 nT/Hz^-1/2 surpasses by a factor of 1000 the Earth's magnetic field sensitivity, showcasing the potential for precise magnetometry applications.

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Scalable Absolute Magnetometry Using Weakly Spin-Coupled Polaron Pair States

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  1. FRG-2 – Using Weakly Spin-Coupled Polaron Pair States for a Calibration Free Absolute Magnetometry W. J. Baker, K. Ambal, D. P. Waters, R. Bardaa, K. v. Schooten, D. R. McCamey, J. M. Lupton, C. Boehme Objective: A precise absolute magnetometer based on organic spintronics that is scalable to micron dimensions, has low cost and that is not adversely affected by environmental influences (temperature, air etc.). Approach: Integrated bipolar MEH-PPV device above magnetic field strip lines for magnetic resonant excitation. The B-field is measured through spin-dependent current changes under magnetic resonance. Results and Significance: For the p-conjugated polymer MEH-PPV, an ABSOLUTE sensitivity of < 50nT/Hz-1/2 is possible. This is about 1000 times more sensitive than the earth’s magnetic field. Figure: (a) Sketch of device design. (b) Device current change at an excitation frequency of 250MHz indicates presence of magnetic field with B=8.9mT Principal Investigators: Anil Virkar, Ajay Nahata & Brian Saam NSF DMR 11-21252; www.mrsec.utah.edu

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