Interfacial oxidation for spin transport in Fe3O4/sulfonic acid molecule nanoparticles. (March 2021)

• Record Type: Journal Article
• Authors: Shi, Xurong; Wang, Shen; Su, Xingliang; Shi, Yujun; Shi, Baojun; Zhou, Haitao; Jiao, Hujun
• Is Part Of: Solid-state electronics. Volume 177(2021)
• Publication Date: 2021-03
• Subjects: Organic spintronics -- Fe3O4/molecules hybrid interface -- TMR effect -- Interface oxidation; Semiconductors -- Periodicals; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.sse.2021.107962
• Languages: English
• ISSNs: 0038-1101

Abstract

Highlights: Generous Co/molecules or (La, Sr)MnO3 /molecules works show that the spinterface plays a key role in organic spintronic devices. However the metal surface is easily oxidized and the Curie temperature of LSMO limits the room temperature applications. We synthesize Fe3 O4 /sulfonic acid molecules nanoparticles in air and nitrogen ambience, respectively, by SAMs to investigate the influence of the oxidation on the spin transport. An identical and robust tunnel magnetoresistance within 0.4% error range is observed for both ambience fabrications, infers that the Fe3 O4 /sulfonic acid spinterface is not sensitive to the oxygen content. These provide Fe3 O4 /molecule interface as a promising candidate for spintronic applications. Abstract: We fabricated the Fe3 O4 /alkyl-sulfonic acid molecules hybrid nanoparticles by self-assembly monolayers (SAMs) in air and nitrogen ambience to investigate the impact of the oxidation on the spin transport. X-ray photoelectron spectra (XPS) and Fourier transform infrared (FTIR) spectroscopy measurements infer that the chemical bonding between Fe3 O4 and alkyl-sulfonic acid remains unchanged as interfacial oxygen content reduced. The resistivity of nitrogen ambience synthesized sample is 1/3 of that in air indicates more tunneling channels are active in less oxygen content samples. The stable and robust room temperature tunnel magnetoresistances up to ∼ 9.9% is observed for both ambience fabrication samples, demonstrating that the magnetoresistance in Fe3 O4 /sulfonic acid nanoparticles is not sensitive to the oxygen. These provide Fe3 O4 /molecule interface as a promising candidate for spintronic applications.