Nickel-substituted manganese spinel ferrite nanoparticles for high-frequency applications. - Channa, Naimatullah; Khalid, Muhammad; Chandio, Ali Dad; Mustafa, Ghulam; Akhtar, Muhammad Saeed; Khan, Junaid Kareem; Ahmad, Jamshed; Kalhoro, Kashif Ali (Journal of Materials Science: Materials in Electronics, 2020)