Atomic-Scale Magnetic Properties of Truly 3d-Diluted ZnO

作者：Mantovan Roberto^*; Gunnlaugsson Haraldur Pall; Johnston Karl; Masenda Hilary; Molholt Torben Esmann; Naidoo Deena; Ncube Mehluli; Shayestehaminzadeh Seyedmohammad; Bharuth Ram Krish; Fanciulli Marco; Gislason Haflidi Petur; Langouche Guido; Olafsson Sveinn; Pereira Lino M C; Wahl Ulrich; Torelli Piero; Weyer Gerd

来源：Advanced Electronic Materials, 2015, 1(1-2): 1400039.

DOI：10.1002/aelm.201400039

In search for dilute magnetic semiconductors, the magnetic properties at the atomic-scale of Fe atoms incorporated in ZnO, in a concentration range of more than five orders of magnitude from 1 x 10(-5) to 2.2 at% have been probed using emission 57 Fe Mossbauer spectroscopy on implanted Mn-57 and Co-57 produced at ISOLDE/CERN. In the ultra-dilute regime (10(-5) at%), the system shows isolated paramagnetic Fe3+ ions with a spin-lattice type of relaxation. At higher concentrations (between 0.02 and 0.2 at%) a transition to spin-spin type of relaxation between neighboring Fe3+ is observed, without any signature of magnetic ordering up to 2.2 at%. Despite the many reports of dilute magnetism in 3d-doped ZnO, this atomic level study shows no evidence of any long-range magnetic ordering between isolated Fe atoms incorporated in the ZnO lattice.

• 出版日期2015-2