Self-biased magnetoelectric response in three-phase laminates

Abstract

Articles you may be interested in Self-biased large magnetoelectric coupling in co-sintered Bi0.5Na0.5TiO3 based piezoelectric and CoFe2O4 based magnetostrictive bilayered composite J. Appl. Phys. 116, 244101 (2014) This study reports the experimental observation and analysis of self-biased magnetoelectric ͑ME͒ effect in three-phase laminates. The 2-2 L-T mode laminates were fabricated by attaching nickel ͑Ni͒ plates and ME particulate composite plates having 3-0 connectivity with 0.948Na 0.5 K 0.5 NbO 3 -0.052LiSbO 3 ͑NKNLS͒ matrix and Ni 0.8 Zn 0.2 Fe 2 O 4 ͑NZF͒ dispersant. The presence of two types of ferromagnetic materials, Ni and NZF, results in built-in magnetic bias due to difference in their magnetic susceptibilities and coercivity. This built-in bias ͑H bias ͒ provides finite ME effect at zero applied magnetic dc field. The ME response of bending mode trilayer laminate NKNLS-NZF/Ni/NKNLS-NZF in off-resonance and on-resonance conditions was shown to be mathematical combination of the trilayers with configuration NKNLS-NZF/Ni/NKNLS-NZF and NKNLS/Ni/NKNLS representing contributions from magnetic interaction and bending strain.

Enhancing the sensitivity of magnetoelectric sensors by increasing the operating frequency

“…The Ni provided a field to bias the ME sensor. 10,11 The measuring system consisted of a set of Helmholtz coils, powered by an Agilent 33220 A signal generator that was used to apply a sinusoidal, time varying field H s along the longitudinal axis of the sensor. In these experiments, we did not employ any flux concentrators.…”

Self-biased converse magnetoelectric effect

“…However, recent studies have revealed that by employing heterogeneous ferromagnetic structure, a large a DME value can be obtained in the absence of H bias , so called self-biased DME effect. [8][9][10] The selfbiased DME effect was observed when the laminates were operated in bending mode and consisted of dissimilar or graded magnetic materials that resulted in built-in magnetic bias. The discovery of self-biased DME effect is encouraging for applications such as self-biased magnetic field sensor.…”

“…9 ] (KNNLS-NZF) ME particulate composite disks with diameter of 10 mm and thickness of 0.5 mm were fabricated. The built-in magnetic bias was created in the sandwich structure (nickel (Ni) plate with dimensions of 15 Â 15 Â 0.5 mm 3 bonded between two KNNLS-NZF disks) due to difference in magnetic characteristics between Ni and NZF such as magnetization, susceptibility, coercivity, magnetostriction, and piezomagnetic coefficient.…”

“…In our previous study, we have shown that the shape of a DME can be controlled by adjusting the concentration of NZF (i.e., effect of built-in bias) or by modifying the structure of laminate. 9,10 The laminate used in this work was optimized to show the peak a DME value at H bias ¼ 0 for clear observation of self-biased effect. The trend of a DME with respect to the sweep directions (arrowed curves [1] and [2]) was the same.…”

“…The built-in magnetic bias was created in the sandwich structure (nickel (Ni) plate with dimensions of 15 Â 15 Â 0.5 mm 3 bonded between two KNNLS-NZF disks) due to difference in magnetic characteristics between Ni and NZF such as magnetization, susceptibility, coercivity, magnetostriction, and piezomagnetic coefficient. 9,10 The electrical connections were made to operate the sample in bending mode configuration. In the DME measurement, H ac was provided by Helmholtz coil (DMEInput) to the laminate and then the induced voltage was measured from the sample (DME-Output).…”