Programmable Input for Nanomagnetic Logic Devices
Lehrstuhl für Technische Elektronik, Technische
Universität München, Theresienstraße 90, 80333
2 Lehrstuhl für Nanoelektronik, Technische Universität München, Theresienstraße 90, 80333 Munich, Germany
3 Center for Nano Science and Technology, University of Notre Dame, Notre Dame, IN 46556, USA
a e-mail: firstname.lastname@example.org
A programmable magnetic input, based on the magnetic interaction of a soft and hard magnetic layer is presented for the ﬁrst time. Therefore, a single-domain Co/Pt nanomagnet is placed on top of one end of a permalloy bar, separated by a thin dielectric layer. The permalloy bar of the introduced input structure is magnetized by weak easy-axis in-plane ﬁelds. Acting like a ’magnetic ampliﬁer’, the generated fringing ﬁelds of the permalloy pole are strong enough to control the magnetization of the superimposed Co/Pt nanomagnets, which have high crystalline perpendicular magnetic anisotropy. This magnetostatic interaction results in a shift of the hysteresis curve of the Co/Pt nanomagnet, measured by magneto-optical Kerr microscopy. The Co/Pt nanomagnet is ﬁxed by the fringing ﬁeld of the permalloy and thereby not affected by the magnetic power clock of the Nanomagnetic Logic system. MFM measurements verify the functionality of the programmable magnetic input structure. The fringing ﬁelds are extracted from micromagnetic simulations and are in good agreement with experimental results. The introduced input structure enables switching the logic functionality of the majority gate from NAND to NOR during runtime, offering programmable Nanomagnetic Logic.
© Owned by the authors, published by EDP Sciences, 2013