Thin-film encapsulation of the air-sensitive organic-based ferrimagnet vanadium tetracyanoethylene

Journal Article · Mon Mar 23 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4916241· OSTI ID:22398776

Froning, I. H.; Harberts, M.; Yu, H.; Lu, Y. ^[1]; Epstein, A. J. ^[2]

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1. Department of Chemistry, The Ohio State University, Columbus, Ohio 43210-1173 (United States)
2. Department of Physics, The Ohio State University, Columbus, Ohio 43210-1117 (United States)

The organic-based ferrimagnet vanadium tetracyanoethylene (V[TCNE]{sub x∼2}) has demonstrated potential for use in both microwave electronics and spintronics due to the combination of high temperature magnetic ordering (T{sub C} > 600 K), extremely sharp ferromagnetic resonance (peak to peak linewidth of 1 G), and low-temperature conformal deposition via chemical vapor deposition (deposition temperature of 50 °C). However, air-sensitivity leads to the complete degradation of the films within 2 h under ambient conditions, with noticeable degradation occurring within 30 min. Here, we demonstrate encapsulation of V[TCNE]{sub x∼2} thin films using a UV-cured epoxy that increases film lifetime to over 710 h (30 days) as measured by the remanent magnetization. The saturation magnetization and Curie temperature decay more slowly than the remanence, and the coercivity is unchanged after 340 h (14 days) of air exposure. Fourier transform infrared spectroscopy indicates that the epoxy does not react with the film, and magnetometry measurements show that the presence of the epoxy does not degrade the magnetic properties. This encapsulation strategy directly enables a host of experimental protocols and investigations not previously feasible for air-sensitive samples and lays the foundation for the development of practical applications for this promising organic-based magnetic material.

• OSTI ID: 22398776
• Journal Information: Applied Physics Letters, Vol. 106, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHEMICAL VAPOR DEPOSITION
COERCIVE FORCE
CURIE POINT
ENCAPSULATION
EPOXIDES
FERRIMAGNETIC MATERIALS
FERRIMAGNETISM
FERROMAGNETIC RESONANCE
FOURIER TRANSFORM SPECTROMETERS
INFRARED SPECTRA
LIFETIME
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
MICROWAVE RADIATION
THIN FILMS
VANADIUM COMPOUNDS