Spin reorientation transitions of Ni/Pd(111) films induced by Fe deposition

Abstract

Two opposite spin reorientation transitions ͑SRTs͒ of Ni/Pd͑111͒ films induced by Fe-capping layers have been investigated in situ by low-energy electron diffraction, magneto-optical Kerr effect, and x-ray magnetic circular dichroism ͑XMCD͒. In pure Ni films grown on Pd͑111͒, no thickness-driven SRT was observed, leaving the magnetization easy axis in plane. Deposition of Fe 1 monolayer ͑ML͒ on Ni͑6 ML͒/Pd͑111͒ causes a transition to perpendicular magnetization, and further Fe 3 ML deposition leads to a return to in-plane magnetization. The XMCD results confirm a contribution of the orbital magnetic moment of a single Fe layer to the first SRT, which gives a significant impact on the Fe-Ni interface that stabilizes perpendicular magnetic anisotropy ͑PMA͒. The second SRT coincides with the structural change in the Fe film from the fcc to bcc phase, where the reduction in the orbital magnetic moment along the perpendicular direction to suppress the PMA stability was observed. It can be proposed that the origin of the second SRT to in-plane magnetization is attributed to cooperative contributions of the structural transformation of the Fe film and the enhanced demagnetizing field.

Electronic structure and magnetic properties of the graphene/Fe/Ni(111) intercalation-like system

“…The Fe L 2,3 XMCD spectrum is in good agreement with previously presented data for the f cc Fe [36,37]. The spin-and orbital-magnetic moments can be estimated from these data assuming the number of holes in the iron layer in the graphene/1 ML Fe(111)/Ni(111) system to be n h = 3.7 (for bulk Fe n h = 3.4; transfer of 0.15e − from Fe to Ni [38] and the same value from Fe to graphene layer [39]; the present theoretical calculations give value of n h = 3.691 for Fe 3d states).…”

“…The Fe L 2,3 XMCD spectrum is in good agreement with previously presented data for the fcc Fe. 36,37 The spin-and orbitalmagnetic moments can be estimated from these data assuming the number of holes in the iron layer in the graphene/1 ML Fe(111)/Ni(111) system to be n h = 3.7 (for bulk Fe n h = 3.4; transfer of 0.15e À from Fe to Ni 38 and the same value from Fe to graphene layer; 39 the present theoretical calculations give the value of n h = 3.691 for Fe 3d states). This number leads to m S = 2.56 AE 0.1 m B and m L = 0.31 AE 0.05 m B for the spin-and orbital-magnetic moments of Fe atoms in the intercalated layer which are in very good agreement with the value of spin-magnetic moment 2.469 m B for Fe obtained in calculations for graphene/1 ML Fe(111)/Ni(111).…”

Insights into the role of magnetoelastic anisotropy in the magnetization reorientation of magnetic nanowires

“…14 In this case, the deposition of few monolayers of magnetic material induced drastic changes in the magnetic easy axis, due to the presence of a strong perpendicular surface anisotropy and enhanced stress. [14][15][16] Besides magnetization measurements, electrical and magnetotransport experiments can also give different insights into magnetic processes in nanostructures. However, and even though the magnetism of ferromagnetic NWs consisting of an interacting dense array or of a single, isolated wire has been exhaustively studied, 6,8,12,13,17,18 to the best of our knowledge, few reports can be found on the T dependence of both electrical resistance [R(T )] 19,20 and magnetoresistance [MR(T )].…”

Unconventional magnetisation texture in graphene/cobalt hybrids

“…3 ). To our knowledge, the thickness range over which the SRT occurs, about 10 ML, is unprecedentedly large compared to what has been reported in previous literature on different systems, such as Co on Pt and Pd 58 , Ni on Cu(100) 59 60 , Fe/Ni on Cu(100) 61 , Fe on Ni/Pd(111) 62 and Co on Au 63 . For comparison, the SRT in pristine Co films is also reported in Fig.…”