Cu sub(2)MnAl thin films grown onto sapphire and MgO substrates: Exchange stiffness and magnetic anisotropy

• Published in: Physica status solidi. A, Applications and materials science Vol. 210; no. 3; pp. 553 - 558
• Main Authors: Belmeguenai, M, Tuzcuoglu, H, Cherif, S M, Westerholt, K, Chauveau, T, Mazaleyrat, F, Moch, P
• Format: Journal Article
• Language: English
• Published: 01.03.2013
• Subjects: Anisotropy; Constants; Exchange; MAGNESIUM OXIDE; Magnetic anisotropy; MAGNETIC PROPERTIES; Magnetization; PROPERTIES; Sapphire; STIFFNESS; THIN FILMS
• ISSN: 1862-6300; 1862-6319
• DOI: 10.1002/pssa.201228187

Cu sub(2)MnAl films of different thicknesses (50, 70, and 100nm) were grown by UHV RF-sputtering on a-plane sapphire or on MgO (100) substrates. Their structural and static magnetic properties have been studied by X-rays diffraction (XRD) and by vibrating sample magnetometry (VSM), respectively. The Cu sub(2)MnAl films exhibit a (100) and (110)-texture when grown on MgO and sapphire substrates, respectively. The best growth quality and the higher magnetization at saturation were obtained for the films grown on MgO. Dynamic magnetic properties were investigated using micro-strip line ferromagnetic resonance (MS-FMR). From the resonance measurements varying the direction and the amplitude of the in-plane and out-of-plane applied magnetic fields we derive the effective magnetization, the Lande g-factor (g=2.11), the exchange constant (A sub(ex)=0.34 mu ergcm super(-1)) and the magnetic anisotropy terms. The in-plane anisotropy can be described as a superposition of two terms showing a small twofold and a dominant fourfold symmetry.