Magnetism and magnetoresistance from different origins in Co/ZnO:Al granular films

Quan, Zheng‐Jun; Liu, Xia; Song, Zhilin; Xu, Xin

doi:10.1016/j.physb.2016.08.039

Cited by 4 publications

(1 citation statement)

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“…DMS oxides also have greater magnetic moments and high curie temperatures, which are essential characteristics for the perfect spintronics material (Han et al, 2002). Additionally, it is possible to further customize the electrical structure, optical band gap, and as well as kind of magnetism in DMS systems by modifying the doped ZnO's particle size and TM atom concentration (Liu and Guyot-Sionnest, 2015;Quan et al, 2016). The multifunctional quantum dots made of ZnO, a transparent, non-toxic, affordable, and biocompatible nanomaterial, have recently attracted a lot of attention for their potential use in cutting-edge processes such as targeted drug delivery using magnetic fields, magnetic tagging, magnetic resonance imaging, and protein-macromolecule separation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of bulk magneto-resistance crossovers in iron doped zinc-oxide using spectroscopic techniques

et al. 2023

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Pellets of Pure and Fe-doped dilute magnetic semiconducting (DMS) samples are studied for bulk magneto-resistance (BMR) at room temperature and at low-temperatures ∼100K. Raman-, photoluminescence- and X-ray photoelectron-spectroscopic techniques are used to determine chemical and electronic structures of the samples. A broadband intense yellow-green-orange luminescence is observed in Fe-doped ZnO samples and emission red-shifts are investigated. Electrical transport is studied with and without applied magnetic field up to 9T and thermal activation and hopping modes of conduction is discussed in light of nature of Fe substitution in the host lattice. Several decremental- to incremental-BMR crossovers are obtained corresponding to experimental variables of Fe concentration 0.025 ≤ x ≤ 0.1, temperature and applied magnetic field. Several possible modes of magneto-transport are discussed to further elucidate the origin of the as-found BMR crossovers in our samples. Positive BMR in pure- and highly doped (x ≥ 0.1) ZnO is found to originate from F-centers and thermal fluctuations, respectively. However, modestly doped (x ≤ 0.05) ZnO exhibit thermally activated conduction and magnetic poloron mediated negative BMR.

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Section: Introductionmentioning

confidence: 99%