Relation between thickness, crystallite size and magnetoresistance of nanostructured La1- x Sr x Mn y O3±δ films for magnetic field sensors

Rasuole Lukose; Valentina Plausinaitiene; Milita Vagner; Nerija Zurauskiene; Skirmantas Kersulis; Virgaudas Kubilius; Karolis Motiejuitis; Birute Knasiene; Voitech Stankevic; Zita Saltyte; Martynas Skapas; Algirdas Selskis; Evaldas Naujalis

doi:10.3762/bjnano.10.24

Relation between thickness, crystallite size and magnetoresistance of nanostructured La_1- _x Sr _x Mn _y O_3±δ films for magnetic field sensors

Beilstein J Nanotechnol. 2019 Jan 23:10:256-261. doi: 10.3762/bjnano.10.24. eCollection 2019.

Authors

Rasuole Lukose¹, Valentina Plausinaitiene^{1

2}, Milita Vagner^{1

2}, Nerija Zurauskiene^{1

3}, Skirmantas Kersulis¹, Virgaudas Kubilius², Karolis Motiejuitis², Birute Knasiene⁴, Voitech Stankevic^{1

3}, Zita Saltyte^{1

2}, Martynas Skapas⁵, Algirdas Selskis⁵, Evaldas Naujalis⁴

Affiliations

¹ Department of Material Science and Electrical Engineering, Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania.
² Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, LT- 03225 Vilnius, Lithuania.
³ Department of Electrical Engineering, Faculty of Electronics, Vilnius Gediminas Technical University, Naugarduko 21, LT- 03227 Vilnius, Lithuania.
⁴ Department of Metrology, Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania.
⁵ Department of Characterization of Materials Structure, Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania.

Abstract

In the present study the advantageous pulsed-injection metal organic chemical vapour deposition (PI-MOCVD) technique was used for the growth of nanostructured La_1- _x Sr _x Mn _y O_3±δ (LSMO) films on ceramic Al₂O₃ substrates. The compositional, structural and magnetoresistive properties of the nanostructured manganite were changed by variation of the processing conditions: precursor solution concentration, supply frequency and number of supply sources during the PI-MOCVD growth process. The results showed that the thick (≈400 nm) nanostructured LSMO films, grown using an additional supply source of precursor solution in an exponentially decreasing manner, exhibit the highest magnetoresistance and the lowest magnetoresistance anisotropy. The possibility to use these films for the development of magnetic field sensors operating at room temperature is discussed.

Keywords: MOCVD growth; colossal magnetoresistance; crystallites; magnetic field sensors; nanostructured films.