Journal of Materials Physics and Chemistry
ISSN (Print): 2333-4436 ISSN (Online): 2333-4444 Website: http://www.sciepub.com/journal/jmpc Editor-in-chief: Dr. A. Heidari
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Journal of Materials Physics and Chemistry. 2018, 6(2), 36-38
DOI: 10.12691/jmpc-6-2-1
Open AccessArticle

Activation Energy Depending on the Thickness of the Ferromagnetic Layer

A. Adanlété Adjanoh1, and R. Belhi2

1Département de Physique, Faculté des Sciences et Techniques, Université de Kara, B.P : 404, Kara, Togo

2Département de Physique, Faculté des Sciences de Tunis, Université de Tunis El Manar, Tunis 1060, Tunisia

Pub. Date: October 23, 2018

Cite this paper:
A. Adanlété Adjanoh and R. Belhi. Activation Energy Depending on the Thickness of the Ferromagnetic Layer. Journal of Materials Physics and Chemistry. 2018; 6(2):36-38. doi: 10.12691/jmpc-6-2-1

Abstract

We present the detailed study of activation energy Ea according to the thickness of the magnetic layer (tCo=0.7,0.8 and 1nm). The study was carried out at room temperature by means of polar magneto-optical Kerr effect magnetometry (PMOKE) using a He–Ne laser (λ=633nm). We found that the activation field μ0Ha, the coercive field μ0HC and the average activation energy Ea are weak for the sample with thickness tCo = 1 nm.

Keywords:
time of demagnetization activation field activation energy activation volume

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References:

[1]  J. Pommier, P. Meyer, G. Pénissard, J. Ferré, P. Bruno, and D. Renard, Magnetization reversal in ultrathin ferromagnetic films with perpendicular anisotropy: Domain observations Phys. Rev. Lett. 65, 2054, 1990.
 
[2]  J. X. Shen, R. D. Kirby, Z. S. Shan, D. J. Sellmyer, and Tl Suzuki, Observation of unequal activation volumes of wall-motion and nucleation processes in Co/Pd multilayers, J. Appl. Phys. 73, 6418, 1993.
 
[3]  P. Bruno, G. Bayreuther, P. Beauvillain, C. Chappert, G. Lugert, D. Renard, J.P. Renard, J. Seiden, Hysteresis properties of ultrathin ferromagnetic films, J. Appl. Phys. 68 (1990) 5759.
 
[4]  M. Czapkiewicz, T. Stobiecki, S. van Dijken, Thermally activated magnetization reversal in exchange-biased [Pt∕Co]3/Pt/IrMn multilayers, Phys. Rev. B 77 (2008) 024416.
 
[5]  R. Belhi, A. Adanlété Adjanoh, J. Vogel, Influence of Pt thickness on magnetization reversal processes in (Pt/Co)3 multilayers with perpendicular anisotropy, J. Magn. Magn. Mater. 324 (2012) 1869-1877.
 
[6]  C. Chappert, D. Renard, P. Beauvillain, J.P. Renard, J. Seiden, Ferromagnetism of very thin films of nickel and cobalt, J. Magn. Magn. Mater. 54 (1986) 795.
 
[7]  C. H. Lee, H. He, F. Lamelas, W. Vavra, C. Uher and R. Clarke, Epitaxial Co-Au Superlattices, Phys. Rev. Lett. 62 (1989) 653.
 
[8]  M. Ohtake, M. Futamoto, F. Kirino, N. Fujita, N. Inaba, Epitaxial growth of hcp/fcc Co bilayer films on Al2O3(0001) substrates J. Appl. Phys. 103 (2008) 07B522.
 
[9]  A. Adanlété Adjanoh, R. Belhi, J. Vogel, O. Fruchart, M. Ayadi, K. Abdelmoula, Magnetization reversal dynamics in Au/Co/Au(111) ultrathin films: Effect of roughness of the buffer layer, J. Magn. Magn. Mater. 322 (2010) 2498.