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Deterministic all-optical magnetization writing facilitated by non-local transfer of spin angular momentum.

Abstract：

:Ever since its discovery around a decade ago, all-optical magnetization switching (AOS) using femtosecond laser pulses has shown potential for future data storage and logic devices. In particular, single pulse helicity independent AOS in certain ferrimagnetic alloys and multilayers is highly efficient and ultrafast. However, in most cases it is a toggle mechanism, which is not desirable for applications. Here we experimentally demonstrate conversion from toggle switching to a deterministic mechanism by biasing AOS in a Co/Gd bilayer with a spin polarized current which is optically generated in an adjacent ferromagnetic reference layer. We show deterministic writing of an 'up' and 'down' state using a sequence of one or two pulses, respectively, and demonstrate the non-local origin by varying the magnitude of the generated spin current. Our demonstration of deterministic magnetization writing could provide an essential step towards the implementation of future optically addressable spintronic memory devices.

journal_name

Nat Commun

journal_title

Nature communications

authors

van Hees YLW,van de Meugheuvel P,Koopmans B,Lavrijsen R

doi

10.1038/s41467-020-17676-6

subject

Has Abstract

pub_date

2020-07-31 00:00:00

pages

3835

issue

1

issn

2041-1723

pii

10.1038/s41467-020-17676-6

journal_volume

11

pub_type

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