Torque acting on the magnetization vector during 90° pulsed magnetization of real garnet ferrite films with in-plane anisotropy
| Autor: | O. S. Kolotov, P. A. Polyakov, G. M. Nikoladze, A. V. Matyunin |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Technical Physics. 60:1809-1814 |
| ISSN: | 1090-6525 1063-7842 |
| Popis: | The torque acting on the magnetization vector in the course of 90° pulsed magnetization of real garnet ferrite films with in-plane and biaxial anisotropy is calculated by a method in which the operating point trajectory is analyzed. The position of the operating point is described by azimuthal angle φ and torque component Tm produced by pulsed magnetizing field Hm. The time dependence of resultant torque Tφ has a sharply ascending portion, within which the nonlinear magnetization oscillations are excited. Additionally, the shape of the curve Tφ(t) within this portion depends on pulse rise time τf only slightly. These results explain the weak dependence of the magnetization oscillation strength on τf, which was experimentally found previously. It is shown analytically that when τf decreases to 2.5–3.0 ns within the initial portion of the curve Tφ(t) at φ ≤ 10°, there arises an extra maximum of torque Tφ. Simultaneously, an additional voltage peak appears in the initial part of the longitudinal magnetization signal. The appearance of the additional voltage peak is confirmed experimentally. |
| Databáze: | OpenAIRE |
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