ridm@nrct.go.th   ระบบคลังข้อมูลงานวิจัยไทย   รายการโปรดที่คุณเลือกไว้

Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method
นักวิจัย : Ilyas, Usman , Rawat, Rajdeep Singh , Tan, T. L. , Lee, P. , Chen, R. , Sun, Handong , Fengji, Li. , Zhang, Sam
คำค้น : DRNTU::Science::Physics::Electricity and magnetism.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Ilyas, U., Rawat, R. S., Tan, T. L., Lee, P., Chen, R., Sun, H. D., et al. (2012). Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method. Journal of applied physics, 111(3), 033503. , 0021-8979 , http://hdl.handle.net/10220/9297 , http://dx.doi.org/10.1063/1.3679129
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of applied physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

This paper investigates the ferromagnetism in ZnO:Mn powders and presents our findings about the role played by the doping concentration and the structural defects towards the ferromagnetic signal. The narrow-size-distributed ZnO:Mn nanoparticles based powders with oxygen rich stoichiometery were synthesized by wet chemical method using zinc acetate dihydrate and manganese acetate tetrahydrate as precursors. A consistent increase in the lattice cell volume, estimated from x-ray diffraction spectra and the presence of Mn 2p3/2 peak at ∼640.9 eV, in x-ray photoelectron spectroscopic spectra, confirmed a successful incorporation of manganese in its Mn2+ oxidation state in ZnO host matrix. Extended deep level emission spectra in Mn doped ZnO powders exhibited the signatures of oxygen interstitials and zinc vacancies except for the sample with 5 at. % Mn doping. The nanocrystalline powders with 2 and 5 at. % Mn doping concentration were ferromagnetic at room temperature while the 10 at. % Mn doped sample exhibited paramagnetic behavior. The maximum saturation magnetization of 0.05 emu/g in the nanocrystalline powder with 5 at. % Mn doping having minimum defects validated the ferromagnetic signal to be due to strong p-d hybridization of Mn ions.

บรรณานุกรม :
Ilyas, Usman , Rawat, Rajdeep Singh , Tan, T. L. , Lee, P. , Chen, R. , Sun, Handong , Fengji, Li. , Zhang, Sam . (2555). Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ilyas, Usman , Rawat, Rajdeep Singh , Tan, T. L. , Lee, P. , Chen, R. , Sun, Handong , Fengji, Li. , Zhang, Sam . 2555. "Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ilyas, Usman , Rawat, Rajdeep Singh , Tan, T. L. , Lee, P. , Chen, R. , Sun, Handong , Fengji, Li. , Zhang, Sam . "Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Ilyas, Usman , Rawat, Rajdeep Singh , Tan, T. L. , Lee, P. , Chen, R. , Sun, Handong , Fengji, Li. , Zhang, Sam . Enhanced indirect ferromagnetic p-d exchange coupling of Mn in oxygen rich ZnO:Mn nanoparticles synthesized by wet chemical method. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.