Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Abstract

Recent progress in the field of organic materials has yielded devices such as organic light emitting diodes (OLEDs) which have advantages not found in traditional materials, including low cost and mechanical flexibility. In a similar vein, it would be advantageous to expand the use of organics into high frequency electronics and spin-based electronics. This work presents a synthetic process for the growth of thin films of the room temperature organic ferrimagnet, vanadium tetracyanoethylene (V[TCNE] x , x~2) by low temperature chemical vapor deposition (CVD). The thin film is grown at <60 °C, and can accommodate a wide variety of substrates including, but not limited to, silicon, glass, Teflon and flexible substrates. The conformal deposition is conducive to pre-patterned and three-dimensional structures as well. Additionally this technique can yield films with thicknesses ranging from 30 nm to several microns. Recent progress in optimization of film growth creates a film whose qualities, such as higher Curie temperature (600 K), improved magnetic homogeneity, and narrow ferromagnetic resonance line-width (1.5 G) show promise for a variety of applications in spintronics and microwave electronics. Video LinkThe video component of this article can be found at

Low loss spin wave resonances in organic-based ferrimagnet vanadium tetracyanoethylene thin films

“…TCNE and V(CO) 6 are used in the ratio of 10:1 at evaporation temperatures of 50℃ and 10℃ , respectively, yielding a deposition rate of 9.3 nm/min. 40 Because of its air-sensitivity, the film is encapsulated using a technique that preserves the magnetic order for over one month under ambient condition. 41 The technique requires applying an epoxy (purchased from Ossila) to the film surface.…”

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

“…The air sensitivity of these films makes it difficult to determine the precise thickness of an individual sample, but the thickness variation within the chamber, mapped in similar depositions, gives a median value of 700 nm with a deviation of 6100 nm. 23 This paper primarily reports variations within a single sample over time, but the uncertainty in sample thickness must be considered when comparing two different samples. Figure 1(a) shows a schematic of the encapsulation process.…”

Magnetic ordering in a vanadium-organic coordination polymer using a pyrrolo[2,3-d:5,4-d′]bis(thiazole)-based ligand

“…CVD or PLD) would yield similar gains in uniformity and improvement in magnetic properties. 40 As observed with other polycyanoorganic-based vanadium coordination polymers, 8 is air-sensitive and should be stored in a sealed tube under inert atmosphere to minimize the degradation of magnetic properties, or encapsulated if synthesized in thin-lm form. 6 Single crystal X-ray analysis of the parent 4-n-hexyl-4H-pyrrolo[2,3-d:5,4-d 0 ]bis(thiazole), its 2,6-diiodo derivative and ligand 7 indicate presence of the disorder in hexyl chains and a linear arrangement between the substituents in positions 2 and 6.…”