Seminarios y Eventos

Seminars and Events

Jornadas Jóvenes Investigadores

Coordinadores: Iñigo Bretos y Lidia Martínez

14 January 2020, 12:00 h. Salón de Actos

Time-resolved measurements of domain wall velocity in amorphous magnetic microwires

Esther Calle Ramírez
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)

The dynamic process of nucleation, propagation and braking of a single domain wall (DW) has been systematically determined in a Fe-based magnetostrictive microwire under the action of an axial magnetic field. While in previous reports the Sixtus-Tonks experiments have provided partial information on the process (i.e., the average velocity), in the present study we report on the instantaneous processes involved in the propagation of the DW, as well as the transient process during the DW depinning. The experimental measurements were carried out using the spontaneous Matteucci effect induced during DW propagation due to the small helical magnetization component created during the fabrication process.

14 January 2020, 12:30 h. Salón de Actos

Magnetic materials with perpendicular magnetic anisotropy (PMA): Different easy ways to control them

Dr. David Navas Otero
Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)

Since the middle of the 1970´s, when Iwasaki et al. proposed perpendicular magnetic recording (PMR) as an alternative to conventional longitudinal magnetic recording [1], thin films with perpendicular magnetic anisotropy (PMA) have been widely studied for recording media applications as well as for patterned magnetic media [2]. Magnetic films with PMA patterned into stripes and lines [3] have been also proposed for nanoscale spintronic devices such as those based on current-driven domain wall motion. Recently, the possibility to use ultrathin films with PMA has opened the path towards the development of skyrmionic devices [4]. Moreover, synthetic antiferromagnets, based on materials with PMA, have been also suggested for biologimedical applications [5].
In this seminar, we will discuss different alternatives to prepare and control nanostructured material with PMA, such as CoCrPt and CoFeB alloys, as well as the study of their related magnetic behaviours.

1. S. Iwasaki, and Y. Nakamura, IEEE Trans. Magn. 14, 436 (1978).
2. S.N. Piramanayagam and K. Srinivasan, J. Magn. Magn. Mater. 321, 485 (2009).
3. S. Emori et al., Nature Materials 12, 611 (2013).
4. A. Fert et al., Nanotechnology 8, 152 (2013).
5. T. Vemulkar et al., Applied Physics Letters 107, 012403 (2015).


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