Magnetoelectric effect in nanogranular FeCo-MgF films at GHz frequencies
| 掲載日 | 2018年1月31日 |
| 発表者 | , , , Shin Yabukami |
| 雑誌名等 | Journal of Magnetism and Magnetic Materials, 446 pp. 80–86 (2018) |
| 概要 | The magnetoelectric effect is a key issue for material science and is particularly significant in the high frequency band, where it is indispensable in industrial applications. Here, we present for the first time, a study of the high frequency tunneling magneto-dielectric (TMD) effect in nanogranular FeCo-MgF films, consisting of nanometer-sized magnetic FeCo granules dispersed in an MgF insulator matrix. Dielectric relaxation and the TMD effect are confirmed at frequencies over 10 MHz. The frequency dependence of dielectric relaxation is described by the Debye-Fröhlich model, taking relaxation time dispersion into account, which reflects variations in the nature of the microstructure, such as granule size, and the inter-spacing between the granules that affect the dielectric response. |