Magnetic memory effect in hollandite-type -K_xMnO₂ monocrystalline nanorods

Memory effect due to spin-glass state below about 20 K has been illustrated in the hollandite-type alpha-KxMnO2 monocrystalline nanorods by systematic magnetization measurements including temperature-and time-dependent magnetization curves in low fields. In this work, we succeeded in writing, reading, and deleting 8-bits digital information in the investigated system. These results show that alpha-KxMnO2 is a good candidate material for a thermal memory cell. The phenomenological droplet model was used in the description of the observed memory effect, whose origin in alpha-KxMnO2 is associated with bulk properties, doping and frustration. (C) 2019 Elsevier B.V. All rights reserved.