TY - JOUR

T1 - Magnetic properties of granulated SiCxNy: Fe films with different structure of alpha-Fe nanoclusters

AU - Stepina, N. P.

AU - Pushkarev, R. V.

AU - Zinovieva, A. F.

AU - Kirienko, V. V.

AU - Bogomyakov, A. S.

AU - Gutakovskii, A. K.

AU - Fainer, N. I.

AU - Dvurechenskii, A. V.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - We report the modification of magnetic properties due to variation of the structure of Fe-contain granules in SiCxNy:Fe films grown by chemical vapor deposition at different temperatures from various gaseous mixtures. It was shown that formation of large composite Fe-granules in the case of structures created using hexamethyldisilazane as source of Si, C, and N atoms results in the hysteresis loop in the magnetization curve appeared only at low temperature (5 K). The ESR spectra are characterized by many ESR lines with sharp asymmetrical shapes and different line widths. The samples with a dense arrays of small homogeneously distributed α-Fe granules, obtained with hexamethylcyclotrisilazane, demonstrate the large saturation magnetization, the hysteresis loop (~135 Oe at 300 K and ~680 Oe at 5 K) and the collective ferromagnetic resonance signal. The pronounced magnetic properties are explained by the formation of the single magnetic domain due to quantum-mechanical tunneling between small coupled α-Fe clusters. Conductivity measurements confirm the existence of the tunneling coupling between Fe-granules even in case of lowest Fe concentration in the samples under study.

AB - We report the modification of magnetic properties due to variation of the structure of Fe-contain granules in SiCxNy:Fe films grown by chemical vapor deposition at different temperatures from various gaseous mixtures. It was shown that formation of large composite Fe-granules in the case of structures created using hexamethyldisilazane as source of Si, C, and N atoms results in the hysteresis loop in the magnetization curve appeared only at low temperature (5 K). The ESR spectra are characterized by many ESR lines with sharp asymmetrical shapes and different line widths. The samples with a dense arrays of small homogeneously distributed α-Fe granules, obtained with hexamethylcyclotrisilazane, demonstrate the large saturation magnetization, the hysteresis loop (~135 Oe at 300 K and ~680 Oe at 5 K) and the collective ferromagnetic resonance signal. The pronounced magnetic properties are explained by the formation of the single magnetic domain due to quantum-mechanical tunneling between small coupled α-Fe clusters. Conductivity measurements confirm the existence of the tunneling coupling between Fe-granules even in case of lowest Fe concentration in the samples under study.

KW - Electron spin resonance

KW - Granulated films

KW - Magnetization

KW - SEMICONDUCTOR

KW - CERAMICS

UR - http://www.scopus.com/inward/record.url?scp=85076139877&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2019.166242

DO - 10.1016/j.jmmm.2019.166242

M3 - Article

AN - SCOPUS:85076139877

VL - 499

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

M1 - 166242

ER -