MAGNETIC RESONANCE IN NANOGRANULAR COMPOSITES: OBSERVATION AND PROPERTIES OF «DOUBLE QUANTUM» EXCITATIONS IN FERROMAGNETIC PARTICLES (726,00 руб.)

Первый автор	Drovosekov
Авторы	Dmitrieva М.U., Rylkov V.V.
Страниц	13

ID	952195
Аннотация	Films of metal-insulator nanogranular composites (CoFeB)x(Al2O3)100−x and (CoFeB)x(SiO2)100−x with different content of metal ferromagnetic phase CoFeB (x ≈ 20−60 at. %) are investigated by electron spin resonance. The experiments are carried out in a wide range of frequencies (f =7−80 GHz) and temperatures (T =4.2−360 K) at different orientations of the magnetic field (up to 24 kOe) with respect to the film plane. Besides the conventional ferromagnetic resonance signal, the experimental spectra contain a weak additional absorption peak which is characterized by a double effective g-factor geff ≈ 4 and demonstrates a number of other unusual properties. The appearance of such a peak in the resonance spectra can be explained in the framework of the quantum mechanical «giant spin» model by the excitation of «forbidden» («double quantum») transitions in magnetic nanogranules with a change of the spin projection Δm = ±2.Here we study the applicability of this model to explain anomalous behavior of the geff ≈ 4 resonance peak, as well as discuss a classical interpretation of the observed phenomena. In particular, the influence of dipolar fields in the films on the frequency-field dependencies for the «double quantum» absorption peak is of interest.

Drovosekov, A.B. MAGNETIC RESONANCE IN NANOGRANULAR COMPOSITES: OBSERVATION AND PROPERTIES OF «DOUBLE QUANTUM» EXCITATIONS IN FERROMAGNETIC PARTICLES / A.B. Drovosekov, М.U. Dmitrieva, V.V. Rylkov // Журнал экспериментальной и теоретической физики .— 2026 .— №2 .— С. 212-224 .— URL: https://rucont.ru/efd/952195 (дата обращения: 12.06.2026)