Research output: Contribution to journal › Article › peer-review
Structural and Magnetic Properties of the Nanocomposite Materials Based on a Mesoporous Silicon Dioxide Matrix. / Grigor'eva, N. A.; Eckerlebe, H.; Eliseev, A. A.; Lukashin, A. V.; Napol'skii, K. S.; Kraje, M.; Grigor'ev, S. V.
In: Journal of Experimental and Theoretical Physics, Vol. 124, No. 3, 03.2017, p. 476-492.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Structural and Magnetic Properties of the Nanocomposite Materials Based on a Mesoporous Silicon Dioxide Matrix
AU - Grigor'eva, N. A.
AU - Eckerlebe, H.
AU - Eliseev, A. A.
AU - Lukashin, A. V.
AU - Napol'skii, K. S.
AU - Kraje, M.
AU - Grigor'ev, S. V.
PY - 2017/3
Y1 - 2017/3
N2 - The structural and magnetic properties of the mesoporous systems based on silicon dioxide with a regular hexagonal arrangement of pores several microns in length and several nanometers in diameter, which are filled with iron compound nanofilaments in various chemical states, are studied in detail. The studies are performed using the following mutually complementary methods: transmission electron microscopy, SQUID magnetometry, electron spin resonance, Mossbauer spectroscopy, polarized neutron small-angle diffraction, and synchrotron radiation diffraction. It is shown that the iron nanoparticles in pores are mainly in the gamma phase of Fe2O3 with a small addition of the a phase and atomic iron clusters. The effective magnetic field acting on a nanofilament from other nanofilaments is 11 mT and has a dipole nature, the ferromagnetic-paramagnetic transition temperature is in the range 76-94 K depending on the annealing temperature of the samples, and the temperature that corresponds to the change in the magnetic state of the iron oxide nanofilaments is T approximate to 50-60 K at H = 0 and T approximate to 80 K at H = 300 mT. It is also shown that the magnetization reversal of an array of nanofilaments is caused by the magnetostatic interaction between nanofilaments at the fields that are lower than the saturation field.
AB - The structural and magnetic properties of the mesoporous systems based on silicon dioxide with a regular hexagonal arrangement of pores several microns in length and several nanometers in diameter, which are filled with iron compound nanofilaments in various chemical states, are studied in detail. The studies are performed using the following mutually complementary methods: transmission electron microscopy, SQUID magnetometry, electron spin resonance, Mossbauer spectroscopy, polarized neutron small-angle diffraction, and synchrotron radiation diffraction. It is shown that the iron nanoparticles in pores are mainly in the gamma phase of Fe2O3 with a small addition of the a phase and atomic iron clusters. The effective magnetic field acting on a nanofilament from other nanofilaments is 11 mT and has a dipole nature, the ferromagnetic-paramagnetic transition temperature is in the range 76-94 K depending on the annealing temperature of the samples, and the temperature that corresponds to the change in the magnetic state of the iron oxide nanofilaments is T approximate to 50-60 K at H = 0 and T approximate to 80 K at H = 300 mT. It is also shown that the magnetization reversal of an array of nanofilaments is caused by the magnetostatic interaction between nanofilaments at the fields that are lower than the saturation field.
KW - SOL-GEL METHOD
KW - FERROMAGNETIC-RESONANCE
KW - PARAMAGNETIC-RESONANCE
KW - IRON NANOWIRES
KW - PARTICLES
KW - NANOPARTICLES
KW - TEMPERATURE
KW - CRYSTAL
U2 - 10.1134/S106377611702011X
DO - 10.1134/S106377611702011X
M3 - статья
VL - 124
SP - 476
EP - 492
JO - Journal of Experimental and Theoretical Physics
JF - Journal of Experimental and Theoretical Physics
SN - 1063-7761
IS - 3
ER -
ID: 9148454