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MA: Fachverband Magnetismus

MA 11: Posters Magnetism III

MA 11.35: Poster

Wednesday, September 29, 2021, 13:30–16:30, P

Magnetization switching of dipolar coupled elongated permalloy nanostructures of high shape anisotropy — Neeti Keswani¹, Yoshikata Nakajima², Neha Chauhan², Tomofumi Ukai², Himadri Chakraborti³, Kantimoy Das Gupta³, Tatsuro Hanajiri², Sakthi Kumar², Yukio Ohno⁴, Hideo Ohno⁴, and •Pintu Das¹ — ¹Department of Physics, Indian Institute of Technology Delhi, New Delhi-110016 — ²Bio Nano Electronics Research Centre, Toyo University, Kawagoe, Saitama-3508585, Japan — ³Department of Physics, Indian Institute of Technology Bombay, Mumbai-400076 — ⁴Research Institute of Electrical Communications, Tohoku University, Sendai, Japan - 9808577

Behavior of nanomagnets of strong shape anisotropy can be studied by modelling them as Ising-like macrospins. Due to the potential use of such macrospin-like nanomagnets in devices such as in nanomagnetic logic etc., a detailed understanding of the exact switching behavior of such nanomagnets coupled via dipolar interaction is essential.

In this work, we have used 2-dimensional electron gas based micro-Hall magnetometry in ballistic transport regime to measure the stray fields emanating from the lithographically patterned elongated nanomagnets of Ni₈₀Fe₂₀ arranged in a double ring like structure. Our results demonstrate that although the magnetic images of the nanomagnets show single-domain behavior, however, their switching process may involve formation of other complex structures such as magnetic vortices, etc. The experimental results are analyzed by performing micro-magnetic simulations for the nanostructures.