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π-anisotropy: a nanocarbon route to hard magnetism

π-anisotropy: a nanocarbon route to hard magnetism
π-anisotropy: a nanocarbon route to hard magnetism
High coercivity magnets are an important resource for renewable energy, electric vehicles, and memory technologies. Most hard magnetic materials incorporate rare earths such as neodymium and samarium, but concerns about the environmental impact and supply stability of these materials are prompting research into alternatives. Here, we present a hybrid bilayer of cobalt and the nanocarbon molecule C60 which exhibits significantly enhanced coercivity with minimal reduction in magnetization. We demonstrate how this anisotropy enhancing effect cannot be described by existing models of molecule-metal magnetic interfaces. We outline a form of anisotropy, arising from asymmetric magnetoelectric coupling in the metal-molecule interface. Because this phenomenon arises from π−d hybrid orbitals, we propose calling this effect π-anisotropy. While the critical temperature of this effect is currently limited by the rotational degree of freedom of the chosen molecule, C60, we describe how surface functionalization would allow for the design of room-temperature, carbon-based hard magnetic films.
2469-9969
Moorsom, Timothy
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Alghamdi, Shoug
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Stansill, Sean
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Poli, Emiliano
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Teobaldi, Gilberto
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Beg, Marijan
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Fangohr, Hans
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Rogers, Matt
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Aslam, Zabeada
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Ali, Mannan
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Hickey, BJ
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Cespedes, Oscar
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Moorsom, Timothy
61c7caed-d462-4518-a6a3-dbdeec49494e
Alghamdi, Shoug
9e2ac490-7c73-4301-8272-c74b6998c2a7
Stansill, Sean
183934b9-b195-42ef-b799-ceba90199ff5
Poli, Emiliano
551f5cff-fbd8-4bd2-b24a-27401c77b846
Teobaldi, Gilberto
b842ef03-dd93-4b6c-946f-51a487c84d15
Beg, Marijan
5c7cc1ff-f244-471f-b964-9f24e0628153
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Rogers, Matt
097213ff-f89d-45d9-8482-14f6373e3695
Aslam, Zabeada
9f491e10-91c8-44f1-b85f-cad65110db51
Ali, Mannan
b9646a70-05a7-4989-b17d-03c44b2daba1
Hickey, BJ
03e23f1e-50d0-42a3-b702-66de1dc51983
Cespedes, Oscar
7573f71e-8462-4f51-b3dd-e681f947b46f

Moorsom, Timothy, Alghamdi, Shoug, Stansill, Sean, Poli, Emiliano, Teobaldi, Gilberto, Beg, Marijan, Fangohr, Hans, Rogers, Matt, Aslam, Zabeada, Ali, Mannan, Hickey, BJ and Cespedes, Oscar (2020) π-anisotropy: a nanocarbon route to hard magnetism. Physical Review B, 101, [060408(R)]. (doi:10.1103/PhysRevB.101.060408).

Record type: Article

Abstract

High coercivity magnets are an important resource for renewable energy, electric vehicles, and memory technologies. Most hard magnetic materials incorporate rare earths such as neodymium and samarium, but concerns about the environmental impact and supply stability of these materials are prompting research into alternatives. Here, we present a hybrid bilayer of cobalt and the nanocarbon molecule C60 which exhibits significantly enhanced coercivity with minimal reduction in magnetization. We demonstrate how this anisotropy enhancing effect cannot be described by existing models of molecule-metal magnetic interfaces. We outline a form of anisotropy, arising from asymmetric magnetoelectric coupling in the metal-molecule interface. Because this phenomenon arises from π−d hybrid orbitals, we propose calling this effect π-anisotropy. While the critical temperature of this effect is currently limited by the rotational degree of freedom of the chosen molecule, C60, we describe how surface functionalization would allow for the design of room-temperature, carbon-based hard magnetic films.

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Accepted/In Press date: 11 February 2020
e-pub ahead of print date: 28 February 2020

Identifiers

Local EPrints ID: 438128
URI: http://eprints.soton.ac.uk/id/eprint/438128
ISSN: 2469-9969
PURE UUID: 54d765a0-2f78-4800-9026-e0d459f47309
ORCID for Marijan Beg: ORCID iD orcid.org/0000-0002-6670-3994
ORCID for Hans Fangohr: ORCID iD orcid.org/0000-0001-5494-7193

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Date deposited: 02 Mar 2020 17:31
Last modified: 19 May 2020 00:43

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Contributors

Author: Timothy Moorsom
Author: Shoug Alghamdi
Author: Sean Stansill
Author: Emiliano Poli
Author: Gilberto Teobaldi
Author: Marijan Beg ORCID iD
Author: Hans Fangohr ORCID iD
Author: Matt Rogers
Author: Zabeada Aslam
Author: Mannan Ali
Author: BJ Hickey
Author: Oscar Cespedes

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