Magnetic diffuse scattering in artificial kagome spin ice

Sendetskyi, Oles and Anghinolfi, Luca and Scagnoli, Valerio and Möller, Gunnar and Leo, Naëmi and Alberca, Aurora and Kohlbrecher, Joachim and Lüning, Jan and Staub, Urs and Heyderman, Laura Jane (2016) Magnetic diffuse scattering in artificial kagome spin ice. Physical Review B, 93 (22). p. 224413. ISSN 2469-9950. (doi: (Full text available)

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The study of magnetic correlations in dipolar-coupled nanomagnet systems with synchrotron X-ray scattering provides a means to uncover emergent phenomena and exotic phases, in particular in systems with thermally active magnetic moments. From the diffuse signal of soft X-ray resonant magnetic scattering, we have measured magnetic correlations in a highly dynamic artificial kagome spin ice with sub-70 nm Permalloy nanomagnets. On comparing experimental scattering patterns with Monte Carlo simulations based on a needle-dipole model, we conclude that kagome ice I phase correlations exist in our experimental system even in the presence of moment fluctuations, which is analogous to bulk spin ice and spin liquid behavior. In addition, we describe the emergence of quasi-pinch points in the magnetic diffuse scattering in the kagome ice I phase. These quasi-pinch points bear similarities to the fully developed pinch points with singularities of a magnetic Coulomb phase, and continually evolve into the latter on lowering the temperature. The possibility to measure magnetic diffuse scattering with soft X-rays opens the way to study magnetic correlations in a variety of nanomagnetic systems.

Item Type: Article
Uncontrolled keywords: nano-magnetic systems, x-ray diffraction, monopole charge order, dimer models
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Gunnar Moller
Date Deposited: 14 Jun 2016 09:33 UTC
Last Modified: 28 Jul 2016 13:09 UTC
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