1. School of ChemistryAndhra UniversityVisakhapatnam 533 003India
2. Pharmacy DepartmentAndhra UniversityVisakhapatnam 533 003India
3. School of PhysicsUniversity of Hyderabad, GachibowliHyderabad 500 046India
4. Thin Film Magnetism GroupCavendish LaboratoryDepartment of PhysicsUniversity of CambridgeCambridge CB3 0HEUK
5. Department of BiotechnologyUniversity of Science and TechnologyHarrisburgPA 17101USA
6. Department of Materials Science and EngineeringChungnam National UniversityDaeduk Science Town305‐764 DaejeonKorea