Title :
Explosive instability of ultrasonic triads under frequency modulated electromagnetic pumping.
Author :
Preobrazhensky, V.L. ; Yevstafiev, O. ; Pernod, P. ; Berzhansky, V.
Author_Institution :
Inst. of Electron., Microelectron. & Nanotechnol. IEMN, ECLille, Villeneuve-d´´Ascq, France
Abstract :
Explosive dynamics of three- phonon bound excitations in ultrasound frequency band is studied experimentally and theoretically on an example of magnetic medium under homogeneous electromagnetic pumping. Development of ultrasonic explosion is distorted by nonlinear acoustic effects in particular by nonlinear frequency shift of generated waves. It is shown in the present paper that a proper choice of frequency modulation of electromagnetic pumping allows to compensate the nonlinear frequency shift of acoustic vibrations and to reveal the quasi- singular amplification typical for explosive instability.
Keywords :
antiferromagnetic resonance; explosions; magnetoacoustic effects; magnetoelastic effects; ultrasonic effects; vibrations; acoustic vibrations; explosive dynamics; explosive instability; frequency modulated electromagnetic pumping; magnetic medium; nonlinear acoustic effects; nonlinear frequency shift; three-phonon bound excitations; ultrasonic explosion; ultrasonic triads; Antiferromagnetic materials; Electromagnetic coupling; Explosives; Frequency modulation; Magnetic anisotropy; Magnetic resonance; Magnetostriction; Perpendicular magnetic anisotropy; Phonons; Soft magnetic materials; antiferromagnet; electromagnetic pumping; explosive dynamics; phase modulation; three- phonon excitation;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441922
