Title :
Magnetoresistance studies of metallic granular and ceramic thin films for microsensor applications
Author :
Halim, S.A. ; Lim, K.P. ; Zainuddin, H. ; Abbas, Z. ; Yusoff, W.M.D.W. ; Saion, E.B. ; Chik, Abdullah ; Sharmiwati, M.S.
Author_Institution :
Dept. of Phys., Universiti Putra Malaysia, Selangor, Malaysia
Abstract :
Thin films of granular metal and manganites ceramic were fabricated using RF magnetron sputtering and pulsed laser deposition techniques. The GMR effect is highly influenced by the shape, size and distribution of the magnetic entities. The highest GMR value of 7.6% for Ag87.0Fe9.5Co3.5 granular film measured at 1 Tesla at room temperature had been obtained. In the polycrystalline manganites system, low-field magnetoresistance (LFMR) had been observed due to the grain boundaries. LFMR of 4.3% and 6.2% measured at 0.1 Tesla at room temperature have been observed for both La-Sr-Mn-O and La-Ba-Mn-O samples. For the La-Sr-Mn-O film, LFMR ratio of 4.5% has been observed. This value meets the requirement as sensor element and it is currently used in many applications such as head sensing in hard disk.
Keywords :
barium compounds; ceramics; cobalt alloys; discontinuous metallic thin films; giant magnetoresistance; iron alloys; lanthanum compounds; magnetic thin films; manganese compounds; microsensors; pulsed laser deposition; silver alloys; sputter deposition; strontium compounds; 1 T; Ag87.0Fe9.5Co3.5; GMR effect; LaBaMnO; LaSrMnO; RF magnetron sputtering; ceramic thin films; grain boundaries; granular metal; low-field magnetoresistance; manganites ceramics; metallic granular thin films; microsensors; polycrystalline manganites system; pulsed laser deposition techniques; Ceramics; Giant magnetoresistance; Iron; Microsensors; Optical pulses; Pulsed laser deposition; Radio frequency; Shape; Sputtering; Transistors;
Conference_Titel :
Semiconductor Electronics, 2004. ICSE 2004. IEEE International Conference on
Print_ISBN :
0-7803-8658-2
DOI :
10.1109/SMELEC.2004.1620933
