Memristive effects in nanopatterned permalloy Kagom\'{e} array

TL;DR

This study investigates memristive effects in nanopatterned permalloy Kagomé arrays, revealing a thermistor effect at low frequencies and suggesting a crossover to memristive behavior at higher frequencies, supported by experimental and modeling evidence.

Contribution

It demonstrates the presence of memristive effects in nanopatterned permalloy and distinguishes them from thermistor effects through experimental and modeling analysis.

Findings

Thermistor effect observed at low frequencies in nanopatterned permalloy.

Small hysteresis (~1%) not caused by thermistor effect.

Crossover from thermistor to memristive behavior predicted at higher frequencies.

Abstract

We study memristive effects in Kagom\'{e} nanopatterned permalloy. We observe that at low frequencies a thermistor effect is present, a phenomenon arising due to the lithography and absent in similar experiments for thin films. However, we also show via an independent anisotropic magnetoresistive study that a small hysteresis accounting for 1% of the effect is not attributable to a thermistive effect. Such effect is also confirmed by a careful subtraction scheme between nearby thermal hysteresis. In the millihertz regime, an effective model is provided to describe the experimental results for the thermistor, showing that there should be a crossover from the millihertz to the gigahertz, from a thermistor to an memresistive effect for nanopatterned permalloy.