Room-temperature ferromagnetism with high magnetic moment in Cu-doped AlN single crystal whiskers |
(a) Typical SEM image of S1. Inset: the high-magnification SEM image of a single Cu-doped AlN whisker of S1. (b) The HRTEM image of S1. Inset: the SAED pattern of S1. (c) Raman spectra of S1, S2, and undoped AlN whiskers. |