Role of growth conditions on magnetic properties of AlCrN grown by molecular beam epitaxy

Crystal Structure and Magnetic Properties of Cr-Doped AlN Films with Various Cr Concentrations

“…[6][7][8][9][10][11][12][13][14][15][16] In particular, Crdoped AlN is one of the most promising materials for practical applications in spin-dependent electronic devices because its Curie temperature has been reported to be above 900 K, which is the highest among III-nitrides. 8,[10][11][12][14][15][16] In the previous reports, the room-temperature ferromagnetism was observed in Cr-doped AlN films fabricated at various substrate temperatures by sputtering 10,15,16) and molecular beam epitaxy, 8,11,12,14) but their magnetic moments were different from each other. In our previous paper, it was reported that the room-temperature ferromagnetism cannot be observed in Cr-doped AlN film with the Cr concentration of 0.07 fabricated at room temperature on a thermally oxidized Si (001) substrate by reactive dc magnetron sputtering.…”

Magnetic and microstructural properties of sputter deposited Cr-doped aluminum nitride thin films on silicon substrates

“…14,18 They argued that the suppressed magnetic moment might be attributed to antiferromagnetic coupling between substitutional Cr ions. 14,18 Furthermore, ferromagnetism was reported for Cr doped AlN thin films deposited on 6H-SiC or sapphire substrates employing molecular beam epitaxy (MBE) at deposition temperatures above 700 C. 3,15,17 Most recently, Shah et al 13 investigated AlN films deposited via RF-plasma-assisted MBE, implanting Cr þ ions and observed a ferromagnetic behavior after applying an additional annealing step at 950 C in a N 2 atmosphere.…”

“…1,3,18 However, the origin of the magnetic behavior, especially considering doping with Cr, is still under investigation. The origin of the room temperature ferromagnetic order has been speculated to be due to clustering and magnetic coupling of Cr 2,15 or defects such as oxygen or nitrogen vacancies based on the bound magnetic polaron model. 14,24 Recent publications argued that the p-d hybridization has a significant impact on the ferromagnetic behavior.…”

Ferromagnetic and Optical Properties of Partially Cu-Doped ZnO Films

“…However, these dopants are ferromagnetic materials and can easily form magnetic impurities, such as Mn 3 O 4 and Co. Thus, a problem has always arisen on the origin of the ZnO-DMSs, whether the FM was intrinsic or from impurity phase [6]. Recently, RTFM in Cu-doped ZnO was demonstrated both theoretically and experimentally [7,8].…”