Bilayered soft/hard magnetic nanowires as in-line writing heads

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Andrade, VM (Author) Other; Caspani, S (Author) Other; Rivelles, A (Author) Other; Bunyaev, SA (Author) Other; Golub, VO (Author) Other; araujo, j. p. (Author) FCUP; G.N. Kakazei (Author) FCUP; Sousa, CT (Author) FCUP; proenca, m. p. (Author) FCUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: MATERIALS & DESIGN

Vol. 222

ISSN: 0264-1275

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-00X-2W4

DOI: 10.1016/j.matdes.2022.111024

Abstract (EN): Multi-segmented cylindrical nanowires (NWs) are the most promising systems for 3D racetrack memory devices, where information is stored as in-line magnetic domains. However, reading and writing information is still a challenge, as external reading/writing heads have to be implemented near the tracks. The writing component should be made of a bilayered soft/hard coupled magnetic system, so that information could be easily written by external magnetic fields. Here, we demonstrate the feasibility of using a Ni90Cu10/Fe20Co80 segmented NW as the writing element, in which magnetic information is written by applying external magnetic fields. Using low-cost template-assisted electrodeposition methods, single, bi- and multi-segmented NW hexagonal arrays of NiCu and FeCo/Au were fabricated. A throughout magnetic characterization using magnetic hysteresis loops, ferromagnetic resonance and first-order reversal curves (FORCs) revealed that the soft segment (NiCu) induced the reversal of the hard segment (FeCo) in a two-step process, reducing its coercive and effective anisotropy fields when coupled. Finally, micromagnetic simulations certified the experimental observations of a multi-step reversal process. This work demonstrates the important role of interface interactions for the future implementation of an inline writing component in a 3D racetrack memory device, enhancing their potential applicability. (C) 2022 Published by Elsevier Ltd.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9