Low-damping ferromagnetic resonance in electron-beam patterned, high- Q vanadium tetracyanoethylene magnon cavities

Andrew Franson; Na Zhu; Seth Kurfman; Michael Chilcote; Denis R. Candido; Kristen S. Buchanan; Michael E. Flatté; Hong X. Tang; Ezekiel Johnston-Halperin

doi:10.1063/1.5131258

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Low-damping ferromagnetic resonance in electron-beam patterned, high- Q vanadium tetracyanoethylene magnon cavities

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Low-damping ferromagnetic resonance in electron-beam patterned, high- Q vanadium tetracyanoethylene magnon cavities

Andrew Franson, Na Zhu, Seth Kurfman, Michael Chilcote, Denis R. Candido, Kristen S. Buchanan, Michael E. Flatté, Hong X. Tang and Ezekiel Johnston-Halperin

APL materials, Vol.7(12), pp.121113-121113-7

12/01/2019

DOI: 10.1063/1.5131258

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Abstract

Integrating patterned, low-loss magnetic materials into microwave devices and circuits presents many challenges due to the specific conditions that are required to grow ferrite materials, driving the need for flip-chip and other indirect fabrication techniques. The low-loss (α = (3.98 ± 0.22) × 10-5), room-temperature ferrimagnetic coordination compound vanadium tetracyanoethylene (V[TCNE]x) is a promising new material for these applications that is potentially compatible with semiconductor processing. Here, we present the deposition, patterning, and characterization of V[TCNE]x thin films with lateral dimensions ranging from 1 μm to several millimeters. We employ electron-beam lithography and liftoff using an aluminum encapsulated poly(methyl methacrylate), poly(methyl methacrylate-methacrylic acid) copolymer bilayer [PMMA/P(MMA-MAA)] on sapphire and silicon. This process can be trivially extended to other common semiconductor substrates. Films patterned via this method maintain low-loss characteristics down to 25 μm with only a factor of 2 increase down to 5 μm. A rich structure of thickness and radially confined spin-wave modes reveals the quality of the patterned films. Further fitting, simulation, and analytic analysis provide an exchange stiffness, Aex = (2.2 ± 0.5) × 10-10erg/cm, as well as insights into the mode character and surface-spin pinning. Below a micron, the deposition is nonconformal, which leads to interesting and potentially useful changes in morphology. This work establishes the versatility of V[TCNE]x for applications requiring highly coherent magnetic excitations ranging from microwave communication to quantum information.

Details

Title: Subtitle: Low-damping ferromagnetic resonance in electron-beam patterned, high- Q vanadium tetracyanoethylene magnon cavities
Creators: Andrew Franson - The Ohio State University
Na Zhu - Yale University
Seth Kurfman - The Ohio State University
Michael Chilcote - The Ohio State University
Denis R. Candido - University of Iowa
Kristen S. Buchanan - Colorado State University
Michael E. Flatté - University of Iowa
Hong X. Tang - Yale University
Ezekiel Johnston-Halperin - The Ohio State University
Resource Type: Journal article
Publication Details: APL materials, Vol.7(12), pp.121113-121113-7
DOI: 10.1063/1.5131258
ISSN: 2166-532X
eISSN: 2166-532X
Grant note: DOI: 10.13039/100000150, name: Division of Emerging Frontiers in Research and Innovation, award: EFMA-1741666
Language: English
Date published: 12/01/2019
Academic Unit: Electrical and Computer Engineering; Physics and Astronomy
Record Identifier: 9984428814802771

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