TY - JOUR
T1 - Influence of film thickness on the electrical and magnetic properties of Co-Fe-Al-O films
AU - Phan, M. H.
AU - Tuan, L. A.
AU - Ha, N. D.
AU - Phan, T. L.
AU - Kim, C. G.
AU - Kim, C. O.
AU - Yu, S. C.
PY - 2007
Y1 - 2007
N2 - Influence of film thickness (t) on the electrical and magnetic properties of Co-Fe-Al-O films has been systematically investigated via means of vibrating sample magnetometry (VSM), permeability spectra and magneto-optical Kerr effect (MOKE). It is found that the electrical resistivity (ρ) decreases as the film thickness increases; ρ = 412.5 μΩmcm for the t = 600 nm sample decreases to ρ = 368.2 μΩcm for the t = 1200 nm sample. The coercive force, measured along the easy-axis direction, decreases as the film thickness increases. Interestingly, along the hard-axis magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative for the t = 600 and 800 nm samples. However, this peculiar feature disappears as t reaches 1200 nm, which is probably attributed to the microstructural change with respect to changes of film thickness. At a frequency of 1GHz, the hard-axis effective permeability decreases from 1252 to 1000 as the film thickness increases from 600 to 1200 nm, respectively. The VSM and MOKE results reveal an increase in magnetic anisotropy in the near-surface region of the film.
AB - Influence of film thickness (t) on the electrical and magnetic properties of Co-Fe-Al-O films has been systematically investigated via means of vibrating sample magnetometry (VSM), permeability spectra and magneto-optical Kerr effect (MOKE). It is found that the electrical resistivity (ρ) decreases as the film thickness increases; ρ = 412.5 μΩmcm for the t = 600 nm sample decreases to ρ = 368.2 μΩcm for the t = 1200 nm sample. The coercive force, measured along the easy-axis direction, decreases as the film thickness increases. Interestingly, along the hard-axis magnetization direction, the magnetic hysteresis loop is reversed and the coercive force is negative for the t = 600 and 800 nm samples. However, this peculiar feature disappears as t reaches 1200 nm, which is probably attributed to the microstructural change with respect to changes of film thickness. At a frequency of 1GHz, the hard-axis effective permeability decreases from 1252 to 1000 as the film thickness increases from 600 to 1200 nm, respectively. The VSM and MOKE results reveal an increase in magnetic anisotropy in the near-surface region of the film.
UR - http://www.scopus.com/inward/record.url?scp=38349194998&partnerID=8YFLogxK
U2 - 10.1002/pssc.200777181
DO - 10.1002/pssc.200777181
M3 - Conference article
AN - SCOPUS:38349194998
SN - 1862-6351
VL - 4
SP - 4589
EP - 4592
JO - Physica Status Solidi (C) Current Topics in Solid State Physics
JF - Physica Status Solidi (C) Current Topics in Solid State Physics
IS - 12
T2 - International Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007)
Y2 - 28 May 2007 through 1 June 2007
ER -