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Nano Lett. 2019 Dec 6. doi: 10.1021/acs.nanolett.9b03352. [Epub ahead of print]

Emergent Dynamics of Artificial Spin-Ice Lattice Based on an Ultrathin Ferromagnet.

Author information

1
Data Storage Institute, Agency for Science Technology and Research (A*STAR) , 2 Fusionopolis Way, #08-01 Innovis , Singapore 138634.
2
Institute of Materials Research and Engineering , Agency for Science Technology and Research (A*STAR) , 2 Fusionopolis Way, #08-03 Innovis , Singapore 138634.
3
Jangsu Key Laboratory of Optoelectronic Technology, Center for Quantum Transport and Thermal Energy Science, School of Physics and Technology , Nanjing Normal University , Nanjing 210023 , China.

Abstract

We present high-frequency dynamics of magnetic nanostructure lattices, fabricated in the form of "artificial spin-ice", that possess magnetically frustrated states. Dynamics of such structures feature multiple resonance excitation that reveals rich and intriguing microwave characteristics, which are highly dependent on field-cycle history. Geometrical parameters such as dimensions and ferromagnetic layer thickness, which control the interplay of different demagnetizing factors, are found to play a pivotal role in governing the dynamics. Our findings are highlighted by the evolution of unique excitations pertaining to magnetic frustration, which are well supported by static magnetometry studies and micromagnetic simulations.

KEYWORDS:

Artificial spin-ice; demagnetization factors; high-frequency dynamics; magnetic frustration

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