APS March Meeting 2016
Volume 61, Number 2
Monday–Friday, March 14–18, 2016;
Baltimore, Maryland
Session L5: Frustrated Magnetism: Artificial Spin Ice
11:15 AM–2:15 PM,
Wednesday, March 16, 2016
Room: 301
Sponsoring
Units:
GMAG DMP
Chair: Jayasimha Atulasimha, Virginia Commonwealth University
Abstract ID: BAPS.2016.MAR.L5.4
Abstract: L5.00004 : Beller Lecture: Artificial Ferroic Systems
11:51 AM–12:27 PM
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Abstract
Author:
Laura Heyderman
(ETH Zurich - Paul Scherrer Institute)
In artificial ferroic systems [1], novel functionality is engineered through
the combination of structured ferroic materials and the control of the
interactions between the different components. I will present two classes of
these systems, beginning with hybrid mesoscopic structures incorporating two
different ferromagnetic layers whose static and dynamic behaviour result
from the mutual imprint of the magnetic domain configurations [2]. Here we
have demonstrated a new vortex core reversal mechanism [3], which occurs
when it is displaced across domain boundaries with a magnetic field.
I will then describe our progress on artificial spin ice, consisting of
arrays of dipolar-coupled nanomagnets arranged in frustrated geometries. We
have employed photoemission electron microscopy to observe the behaviour of
emergent magnetic monopoles in an array of nanomagnets placed on the kagome
lattice [4]. We have also created artificial spin ice with fluctuating
magnetic moments and observed the evolution of magnetic configurations with
time. This has provided a means to study relaxation processes with a
controlled route to the lowest-energy state [5]. Recently, we have
demonstrated with muon spin relaxation that these magnetic metamaterials can
support thermodynamic phase transitions [6], and future directions include
the incorporation of novel magnetic materials such as ultrathin magnetic
films [7], the investigation of 3D structures [8], as well as the
implementation of x-ray resonant magnetic scattering to study magnetic
correlations in smaller nanomagnets and at faster timescales [9].
[1] L.J. Heyderman and R.L. Stamps, JPCM (2013); [2] G. Heldt et al., APL
(2014); [3] P. Wohlhuter et al., Nature Comms (2015); [4] E. Mengotti et
al., Nature Phys. (2011); [5] A. Farhan et al., Nature Phys. and PRL (2013);
[6] L. Anghinolfi et al., Nature Comms (2015); [7] V. Kapaklis et al.,
Nature Nanotech. (2014); [8] C. Donnelly et al., PRL (2015); [9] J. Perron
et al., PRB (2013)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2016.MAR.L5.4