journal article

Journal Article

ACS Applied Nano Materials. 2020, 3(2), p. 1592-1599

Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording

American Chemical Societyservice

English

2020-01-16

https://doi.org/10.1021/acsanm.9b02371

Sato K., Yasuda H.. Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording. ACS Applied Nano Materials 3, 1592 (2020); https://doi.org/10.1021/acsanm.9b02371.

We observed an order-disorder transition confined to the interface of Pd@Co core-shell nanoparticles with a Pd core and Co shell. A local ordered region with the L1₀- and L1₂-type ordered structure 2-3 nm in size was formed in a ∼12 nm-sized particle. The local atomic order was only achieved in the narrow temperature range of 573-723 K, where the diffusion length is limited to a short-range comparable to the nearest-neighbor distance of the Co-Pd solid solution. Once the atom migration was activated (T ≥ 773 K), alloying of Co and Pd proceeded rapidly, and the ordered phase disappeared along with the core-shell structure. Namely, the stability of the ordered phase was diffusion controlled. Chemically sensitive atomic-resolution electron microscopy enabled detection of the local atomic order formed in a nanoparticle. Such local atomic order has the potential to enable tuning of the magnetic anisotropy of bimetallic nanomagnets, which may open a new route to realize ultrahigh-density magnetic storage media.

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsanm.9b0237.

97373

Order-Disorder Transitions Confined at the Interface of Pd@Co Core-Shell Nanoparticles: Implications for Magnetic Recording

American Chemical Societyservice

English

2020-01-16

ACS Applied Nano Materials

3

2

1592

1599

https://doi.org/10.1021/acsanm.9b02371

https://hdl.handle.net/11094/97373