Lorentz microscopy mapping for domain walls structure study in L10 FePd thin films

Aurélien Masseboeuf (1) , Christophe Gatel (1, 2) , Pascale Bayle-Guillemaud (1) , Alain Marty (1) , Jean-Christophe Toussaint (3)

1 INAC - Institut Nanosciences et Cryogénie
2 CEMES - Centre d'élaboration de matériaux et d'études structurales
3 NEEL - MNM - Micro et NanoMagnétisme

Thin film alloys with perpendicular anisotropy were studied using Lorentz Transmission Electron Microscopy (LTEM). This work focuses on the configuration of domain walls and demonstrates the suitability and accuracy of LTEM for the magnetic characterisation of perpendicular magnetic anisotropy materials. Thin films of chemically ordered ($\unit{L1_0}$) FePd alloys were investigated by micro-magnetic modelling and LTEM phase retrieval approach. The different components of magnetization described by the modeling were studied on experimental images and confirmed by LTEM contrast simulation. Furthermore, quantitative measurements of magnetic induction inside the domain walls were made by using an original method to separate the electrical and magnetical contributions to the phase information. Irregularities were also observed along the domain walls which could play a major role during the magnetization processes.

Mots clés: Lorentz Microscopy; FePd; MIP removal

Domaines: Instrumentations et Détecteurs [physics.ins-det]

Aurélien Masseboeuf, Christophe Gatel, Pascale Bayle-Guillemaud, Alain Marty, Jean-Christophe Toussaint. Lorentz microscopy mapping for domain walls structure study in L10 FePd thin films. Ultramicroscopy, 2009, 110 (1), pp.20-25. ⟨10.1016/j.ultramic.2009.08.006⟩. ⟨hal-00411103⟩