Origin of hysteretic magnetoelastic behavior in magnetoelectric 2-2 composites

Abstract

The local magnetization behavior of the magnetostrictive phase of ferromagnetic/piezoelectric magnetoelectric composites is compared to the hysteretic response using advanced magneto-optical imaging. Local magnetoelastic relaxation leads to the formation of magnetization modulated branched domain structures in the magnetic phase. This results in a complex field response governed by interlocking domain processes. An interrelation of magnetic domain formation and the piezomagnetic response is derived, revealing the origin of the hysteretic magnetoelectric response. As a result, domain wall induced effects lead to a reduction of magnetoelectric signal. Controlling the magnetic domain formation processes is the foundation for reversible magnetoelectric behavior.

Mechanical-Resonance-Enhanced Thin-Film Magnetoelectric Heterostructures for Magnetometers, Mechanical Antennas, Tunable RF Inductors, and Filters

“…Magnetic domain activity plays an important role for the noise characteristic in ME-based devices. Moreover, due to stress-strain effects [64,65] in the ME structures, the actual magnetic material properties, especially the effective magnetic anisotropy, may become local in nature. Only a few methods allow for a spatially resolved characterization of the magnetization response down to the device level.…”

“…This includes obtaining quantitative information on the magnetic domain distribution. Figure 2b shows a quantitative domain image from the edge of a ME structure [65]. The characteristic domain pattern is because of stress relaxation at the device edges.…”

“…Magnetoelastic interactions lead to an effective inversion of the magnetic anisotropy axis with effects on magnetization reversal and magnetic noise behavior in ME structures. Analyzing the spatial magnetic response also permits directly correlating the magnetic domain characteristics and ME response [65,70]. It was shown that the ME amplitude and working point, beyond material properties, are strongly dependent on the exhibited domain configuration.…”

Directional magnetoelectric effect in multi-electrode Pb(Zr,Ti)O3/Ni cylindrical layered composite

“…Therefore, the ME effect is omni-directional in the whole PZT ring and the four units exhibit equivalent ME effect with almost the same α E,V and φ at the first peak. In the case of θ = 0°, the magnetostrictive strain strongly depends on the change of the magnetization component perpendicular to the sensing field [27]. The strain transferred to the piezoelectric phase of units 1 and 3 differs from that of units 2 and 4 as a result of different magnetization in the Ni layers.…”

Advanced magneto-optical microscopy: Imaging from picoseconds to centimeters - imaging spin waves and temperature distributions (invited)

“…11 However, due to the modulation field, Barkhausen noise can add to the sensor signal. 5,12 Insight into the underlying magnetic domain mechanism can be gained by time-resolved MOKE experiments at the sensor's mechanical resonance frequency. …”