Ultra-narrow ferromagnetic resonance in organic-based thin films grown via low temperature chemical vapor deposition

Abstract

We present the growth of thin films of the organic-based ferrimagnetic semiconductor V[TCNE]x (x ∼ 2, TCNE: tetracyanoethylene) via chemical vapor deposition. Under optimized growth conditions, we observe a significant increase in magnetic homogeneity, as evidenced by a Curie temperature above 600 K and sharp magnetization switching. Further, ferromagnetic resonance studies reveal a single resonance with full width at half maximum linewidth of 1.4 G, comparable to the narrowest lines measured in inorganic magnetic materials and in contrast to previous studies that showed multiple resonance features. These characteristics are promising for the development of high frequency electronic devices that take advantage of the unique properties of this organic-based material, such as the potential for low cost synthesis combined with low temperature and conformal deposition on a wide variety of substrates.

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

“…17 Previously, attempts to address this air sensitivity have relied primarily on customized airtight sample containers that allow for transfer from the glove box used for synthesis to specific measurement tools. 11,16 However, this approach is not universally applicable and significantly limits opportunities for applications and ex situ experimental probes. An alternate strategy is to directly encapsulate the film in an impermeable matrix while still in the glovebox.…”

“…7,9 Similarly, organic-based magnets have aroused interest due to their potential for use in high frequency magnetoelectronics and spintronic devices. 9,10 In particular, vanadium tetracyanoethylene (V[TCNE] x$2 ) exhibits room temperature magnetic ordering (T C > 600 K), 11,12 narrow ferromagnetic resonance (FMR) linewidth (peak to peak linewidth of 1 G), 11 and semiconducting properties (E g $ 0.5 eV, r $ 0.01 S/cm). 12,13 Recently, thin films of V[TCNE] x$2 grown via low-temperature chemical vapor deposition (CVD) have been used in both hybrid inorganic-organic 14 and allorganic 15 spin valves and as a spin-polarized electrode in a light-emitting diode.…”

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

“…Interest in low-loss magnetic thin films has been growing due to potential applications in magnonics and quantum information as well as the potential for compact, highefficiency magnetoelectric devices. [1][2][3] In the field of magnonics and spintronics, yttrium iron garnet (Y 3 Fe 5 O 12 , YIG), an electrically insulating ferrite that exhibits extremely low Gilbert damping, α ≈ 6 × 10 −5 and a linewidth of 3.4 G at 9.6 GHz for pristine nanometer-thick films, is currently the leading material for magnetoelectronic circuits. 4,5 The low-damping present in YIG films has led to its incorporation in magnetoelectric circuits and it also plays a prominent role in the study of magnonics research.…”

“…Growth of V[TCNE] x is described in previous work. 1 After transfer of the films from the growth glovebox to the liftoff glovebox, liftoff is performed in dichloromethane. For the feature sizes and thicknesses used here, liftoff occurred in a few minutes with gentle agitation from a Pasteur pipette.…”

A New Family of High Tc Molecule-Based Magnetic Networks: V[x-ClnPTCE]2·yCH2Cl2 (PTCE = Phenyltricyanoethylene)

“…The ferrimagnet V[TCNE] 2 •yCH 2 Cl 2 (where y < 0.5) was discovered in 1991, and improved syntheses have yielded samples with ordering temperatures (or critical temperatures, T c s) up to 400 K [1][2][3]. As a room temperature magnetic semiconductor, films of V[TCNE] 2 show potential for application in spintronics [4,5], a point emphasized by the extremely narrow ferromagnetic resonance spectra [6]. Efforts by us and others to tune the properties of V[TCNE] 2 -like magnets have involved the preparation of compounds with other transition metal ions [7], combinations of metal ions [8,9], and other conjugated polynitriles [10][11][12][13][14][15][16][17].…”