Formation of ZnO nanosheets with room-temperature ferromagnetism by co-doping with Mn and Ni

Successful synthesis of room-temperature ferromagnetic semiconductors, (Cu, Co) co-doped ZnO film is obtained by sol-gel method. It is found that the essential ingredient in achieving room-temperature ferromagnetism is Cu co-doping. By Hall-effect measurement ap-type conductivity was observed for the Cu co-doped films, which induced the room-temperature ferromagnetism.

Download Full-text

Tailoring of room temperature ferromagnetism and electrical properties in ZnO by Co (3d) and Gd (4f) element co-doping

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2016.08.287 ◽

2017 ◽

Vol 691 ◽

pp. 739-749 ◽

Cited By ~ 25

Author(s):

Santanu Das ◽

Sukhen Das ◽

Dipankar Das ◽

Soumyaditya Sutradhar

Keyword(s):

Electrical Properties ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Co Doping

Download Full-text

Cu co-doping effect on electronic structure and room temperature ferromagnetism of TiO2:V nanoparticles

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-017-8309-0 ◽

2017 ◽

Vol 29 (5) ◽

pp. 3751-3758

Author(s):

Abdur Rahim ◽

Saif Ullah Awan ◽

S. K. Hasanain ◽

L. E. G. Armas

Keyword(s):

Electronic Structure ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Doping Effect ◽

Co Doping

Download Full-text

Synthesis of nontoxic Co:CuInS2@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism

RSC Advances ◽

10.1039/c5ra23558h ◽

2016 ◽

Vol 6 (23) ◽

pp. 19430-19436 ◽

Cited By ~ 2

Author(s):

Jin Shen ◽

Chunlei Wang ◽

Shuhong Xu ◽

Yiping Cui

Keyword(s):

Shell Thickness ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Co Doping ◽

Zns Nanocrystals ◽

Doping Ratio

Fluorescent and room temperature ferromagnetic bi-functional Co:CuInS2@ZnS NCs were synthesized through controlling the Co doping ratio and ZnS shell thickness.

Download Full-text

Ga1-xGdxN-Based Spin Polarized Light Emitting Diode

MRS Proceedings ◽

10.1557/opl.2011.584 ◽

2011 ◽

Vol 1290 ◽

Author(s):

Muhammad Jamil ◽

Tahir Zaidi ◽

Andrew Melton ◽

Tianming Xu ◽

Ian T. Ferguson

Keyword(s):

Room Temperature ◽

Light Emitting Diode ◽

Room Temperature Ferromagnetism ◽

Polarized Light ◽

Type Material ◽

Degree Of Polarization ◽

Co Doping ◽

Spin Polarized ◽

P Type ◽

Co Doped

ABSTRACTIn this work, a room temperature spin-polarized LED based on ferromagnetic Ga1-xGdxN is reported. The device was grown by metalorganic chemical vapor deposition (MOCVD) and is the first report of a spin-LED based on Ga1-xGdxN. Electroluminescence from this device had a degree of polarization of 14.6% at 5000 Gauss and retained a degree of polarization of 9.3% after removal of the applied magnetic field. Ga1-xGdxN thin films were grown on 2 μm GaN templates and were co-doped with Si and Mg to achieve n-type and p-type materials. Co-doping of the Ga1-xGdxN films with Si produced conductive n-type material, while co-doping with Mg produced compensated p-type material. Both Si and Mg co-doped films exhibited room temperature ferromagnetism, measured by vibrating sample magnetometry.

Download Full-text

Increased room temperature ferromagnetism in Co-doped tetrahedral perovskite niobates

Royal Society Open Science ◽

10.1098/rsos.210121 ◽

2021 ◽

Vol 8 (10) ◽

Author(s):

Yi Zhou ◽

Qing He ◽

Fei Zhou ◽

Xingqi Liao ◽

Yong Liu ◽

...

Keyword(s):

Room Temperature ◽

Magnetic Semiconductors ◽

Room Temperature Ferromagnetism ◽

Dilute Magnetic Semiconductors ◽

Defect Band ◽

Co Doping ◽

Band Absorption ◽

Local Spin Polarization ◽

Curie Temperatures ◽

Co Doped

Dilute magnetic semiconductors (DMSs), such as (In, Mn)As and (Ga, Mn)As prototypes, are limited to III–V semiconductors with Curie temperatures ( T c ) far from room temperature, thereby hindering their wide application. Here, one kind of DMS based on perovskite niobates is reported. BaM x Nb (1− x ) O 3− δ ( M = Fe, Co) powders are prepared by the composite-hydroxide-mediated method. The addition of M elements endows BaM x Nb (1− x ) O 3− δ with local ferromagnetism. The tetragonal BaCo x Nb (1− x ) O 3− δ nanocrystals can be obtained by Co doping, which shows strong saturation magnetization ( M sat ) of 2.22 emu g −1 , a remnant magnetization ( M r ) of 0.084 emu g −1 and a small coercive field ( H c ) of 167.02 Oe at room temperature. The ab initio calculations indicate that Co doping could lead to a 64% local spin polarization at the Fermi level ( E F ) with net spin DOS of 0.89 electrons eV −1 , this result shows the possibility of maintaining strong ferromagnetism at room temperature. In addition, the trade-off effect between the defect band absorption and ferromagnetic properties of BaM x Nb (1− x ) O 3− δ is verified experimentally and theoretically.

Download Full-text