UV optical properties of ferromagnetic Mn-doped ZnO thin films grown by PLD

Diaconu, Mariana; Schmidt, Heidemarie; Hochmuth, H.; Lorenz, Michael; Benndorf, G.; Lenzner, J.; Spemann, D.; Setzer, A.; Nielsen, Karl‐Wilhelm; Esquinazi, P.; Grundmann, Marius

doi:10.1016/j.tsf.2004.11.211

Cited by 69 publications

(34 citation statements)

References 22 publications

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“…% Li doping in ZnO. As such domain formation conclusively proves the occurrence of ferromagnetism and has been reported for many DMSs, [17][18][19] it can be said that intrinsic ferromagnetism in ZnO is possible with the doping of spin half-alkali atom Li.…”

Section: Resultssupporting

confidence: 72%

Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods

2009

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We have observed ferromagnetism in Li-doped ZnO nanorods with Curie temperature up to 554 K. Li forms shallow acceptor states in substitutional zinc sites giving rise to p-type conductivity. An explicit correlation emerges between increase in hole concentration with decrease in magnetization and Curie temperature in ZnO:Li. Occurrence of ferromagnetism at room temperature has been established with observed magnetic domain formation in ZnO:Li pellets in magnetic force microscopy and prominent ferromagnetic resonance signal in electron paramagnetic resonance spectrum. Magnetic ZnO:Li nanorods are luminescent, showing strong near UV emission. Substitutional Li atoms can induce local moments on neighboring oxygen atoms, which when considered in a correlated model for oxygen orbitals with random potentials introduced by dopant atom could explain the observed ferromagnetism and high Curie temperature in ZnO:Li nanorods.

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Section: Resultssupporting

confidence: 72%

Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods

2009

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“…The orientation and distribution of domains become nonuniform as Li concentration increases as well as overlapping of domains occurs resulting in decrease in magnetization. Such a domain mapping by MFM provides a conclusive evidence of FM, As this has been reported for many DMS, 9,24,25 it is inferred that observed FM in Li and Na doped ZnO is an intrinsic property of the material arising due to alkali doping.…”

Section: E Mfmsupporting

confidence: 70%

High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods

Chawla

Jayanthi

Kotnala

2009

Journal of Applied Physics

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Recent efforts in developing spintronic and magneto-optoelectric material for applications have relied on the use of magnetic semiconductors doped with transition metals and have met with limited success. Using a fresh synthesis approach using alkali ions we demonstrate that alkali doped zinc oxide can provide high temperature magnetic semiconductors. We report studies on nanocrystalline powder and pellets of p-type ZnO:Li and ZnO:Na that exhibit ferromagnetism up to 554 K. The ferromagnetic behavior was confirmed from magnetic hysteresis, ferromagnetic resonance, magnetic force microscopy, and explained by a model where substitutional Li + / Na + in cation site induce local magnetic moments on oxygen atoms. Optimum dopant concentrations enable ferromagnetic exchange interaction leading to high Curie temperature.

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“…Sharma et al [16] have published the first observation of room temperature ferromagnetism in Mn doped ZnO. Ferromagnetism near or above room temperature has already been reported for Mn-alloyed ZnO nanocrystals, pellets and thin films [17,18]. In the present study, we demonstrate the magnetic properties such as magnetic domain observation and magnetic moment measurements for the Mn doped ZnO film grown on Si (100) using sol-gel technique.…”

Section: Introductionsupporting

confidence: 56%

Ferromagnetic Domain Behaviors in Mn doped ZnO Film

Soundararajan¹,

Santoyo-Salazar²,

Ko³

et al. 2011

Journal of Magnetics

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Mn doped ZnO films were prepared on Si (100) substrates using sol-gel method. The prepared films were annealed at 550ºC for decomposition and oxidation of the precursors. XRD analysis revealed the presence of ZnMnO hexagonal wurtzite phase along with the presence of small quantity of ZnMn 2 O 3 secondary phase and poor crystalline nature. The 2D, 3D views of magnetic domains and domain profiles were obtained using magnetic force microscopy at room temperature. Rectangular shaped domains with an average size of 4.16 nm were observed. Magnetic moment measurement as a function of magnetic field was measured using superconducting quantum interference device (SQUID) magnetometry at room temperature. The result showed the ferromagnetic hysteresis loop with a curie temperature higher than 300 K.

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UV optical properties of ferromagnetic Mn-doped ZnO thin films grown by PLD

Cited by 69 publications

References 22 publications

Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods

Room-temperature ferromagnetism in Li-dopedp-type luminescent ZnO nanorods

High temperature carrier controlled ferromagnetism in alkali doped ZnO nanorods

Ferromagnetic Domain Behaviors in Mn doped ZnO Film

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