From Sm1-xGdxAl2 electronic properties to magnetic tunnel junctions based on Sm1-xGdxAl2 and/or [Co/Pt] electrodes: Towards the integration of Zero Magnetization ferromagnets in spintronic devices

Abstract : The general context of this work is the development and integration of new magnetic materials with original properties of potential interest for spintronic applications. In this field, the Sm1-xGdxAl2 (SGA) compound drives a particular attention, as a zero-magnetization ferromagnet that can exhibit a spin polarization in its magnetic compensated state. In a first step, synchrotron-based angle and spin resolved photoemission spectroscopy experiments have permitted to perform an accurate analysis of the electronic structure along various directions of the Brillouin Zone and to get a direct estimation of the spin polarization at the Fermi level. In a second step, a special attention has been the paid to [Co/Pt] multilayers and to [Co/Pt]-based MTJs. The [Co/Pt] multilayers would constitute the second electrode in SGA-based MTJs. Their magnetic properties (especially the perpendicular anisotropy and the saturation magnetization) have been carefully investigated as a function of Pt thickness and nature of the buffer layer (Pt, MgO or Al2O3), and in close connection with structural characteristics. Their integration in [Co/Pt]-based MTJs has permitted to determine the [Co/Pt] effective tunnel polarization and to unravel the magnetic configurations of both electrodes which are perfectly explained and reproduced by micromagnetic simulations. In a third step, the results concerning the magneto-transport experiments in SGA/MgO/[Co/Pt] MTJs are presented and discussed
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01751015
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 1:01:46 PM
Last modification on : Tuesday, August 21, 2018 - 9:46:04 AM

File

DDOC_T_2014_0146_BERSWEILER.pd...
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01751015, version 1

Citation

Mathias Bersweiler. From Sm1-xGdxAl2 electronic properties to magnetic tunnel junctions based on Sm1-xGdxAl2 and/or [Co/Pt] electrodes: Towards the integration of Zero Magnetization ferromagnets in spintronic devices. Other [cond-mat.other]. Université de Lorraine, 2014. English. ⟨NNT : 2014LORR0146⟩. ⟨tel-01751015⟩

Share

Metrics

Record views

43

Files downloads

82