Magnetic moment of Mn in the ferromagnetic semiconductor (Ga0.98Mn0.02)As

Abstract

We have studied the quasibinary ferromagnetic semiconductor (Ga0.98Mn0.02)As by magnetic circular dichroism in x-ray absorption. We find a richly structured Mn absorption spectrum typical for localized 3d electrons. An analysis of the magnetization-averaged and dichroism line shapes shows a local Mn moment of 4.6μB, which is close to the Hund’s rule moment for the half-filled 3d shell. The magnitude of the dichroism reveals that only about 1/7 of the Mn atoms participate in the ferromagnetic order. Our experiment does not show a distinction between the ferro- and paramagnetic Mn atoms.

Identifying the character of ferromagnetic Mn in epitaxial Fe/(Ga,Mn)As heterostructures

“…The XAS/XMCD arising from Mn-1 has been associated to a mixed-valence ground state due to the large Mn 3d hybridization with the surrounding 4sp states. 19,24,25 Numerical calculations indicated a mixed 80% d 5 -20% d 6 L ground state ͑L is a ligand hole͒. 24,25 In Mn-AP, both the energy shift of the XMCD minimum and the line shape suggest a different valence state with lower occupancy of the 3d levels, implying a lowering of the d 6 character and increment of the d 5 one.…”

Intrinsic hole localization mechanism in magnetic semiconductors

“…Within this class of materials, the magnetic semiconductors are particularly challenging, not only because they can replace magnetic elements in storage media, but because they can be used as spin injectors into normal semiconductors [3,4] for completely novel applications. In the field of magnetic semiconductors a new chapter has been opened by the III-V diluted magnetic semiconductors (DMS), especially with (Ga, Mn)As.Experimentally (Ga, Mn)As can be manufactured using low-temperature molecular beam epitaxy (LT-MBE) [5,6,7,8] and its magnetic properties have been measured with numerous techniques [5,6,7,8,9,10,11]. (Ga,Mn)As is ferromagnetic (see e.g.…”

“…Experimentally (Ga, Mn)As can be manufactured using low-temperature molecular beam epitaxy (LT-MBE) [5,6,7,8] and its magnetic properties have been measured with numerous techniques [5,6,7,8,9,10,11]. (Ga,Mn)As is ferromagnetic (see e.g.…”

Mn3delectronic configurations in(Ga1−xMnx)Kronast1, Ovsyannikov2, Vollmer3 et al. 2006Phys. Rev. B120110View full textAdd to dashboardCite

“…12 The contribution of magnetic and nonmagnetic 3d states to the x-ray absorption process can be separated by using the difference ͑XMCD͒ and sum ͑XAS͒ of spectra taken with opposite x-ray helicities. Although these techniques have been applied to ͑Ga 1−x Mn x ͒As previously, [13][14][15][16][17] the results are in some points inconsistent. The first experiments 13,14 found a pronounced multiplet structure in the Mn XAS spectra characteristic of a highly localized state.…”

“…Although these techniques have been applied to ͑Ga 1−x Mn x ͒As previously, [13][14][15][16][17] the results are in some points inconsistent. The first experiments 13,14 found a pronounced multiplet structure in the Mn XAS spectra characteristic of a highly localized state. The weak XMCD signal indicated that only a fraction of 13% of the Mn atoms participate in the longrange ferromagnetic ordering.…”