Noncollinear Surface Spin Density by Surface Reconstruction in the Alloy NiMn

Cl, Gao; Ernst, A.; Winkelmann, Aimo; Henk, J.; Wulfhekel, Wulf; Bruno, P.; Kirschner, J.

doi:10.1103/physrevlett.100.237203

Cited by 29 publications

(24 citation statements)

References 18 publications

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“…Not only the sign of the asymmetry is preserved, but also the monotonous variation as a function of θ Co . The physical concept reported here can be of general application in a large variety of magnetic substrates with noncollinear ground states: 2 AL Fe/Cu(111) [26], 2 AL Mn/W(110) [22], 1 AL Mn/W(100) [27], 1 AL Mn/Ag(111) [21], 2 AL Fe/W(110) [28], 1 AL Fe/Ir(111) [29], and NiMn(001) [30]. This work opens a way to study not only the coupling of adatoms to those substrates, but also the possible magnetic interactions among atoms in artificial structures built by atomic manipulation.…”

Section: (D) and 2(e) Provided That P T = 0 And Aφ/w < 90mentioning

confidence: 99%

Spin-sensitive shape asymmetry of adatoms on noncollinear magnetic substrates

et al. 2016

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The spin-resolved density of states of Co atoms on a noncollinear magnetic support displays a distinct shape contrast, which is superimposed on the regular height contrast in spin-polarized scanning tunneling microscopy. The apparent atom height follows the well-known cosine dependence on the angle formed by the tip and adatom local magnetization directions, whereas the shape contrast exhibits a sine dependence. We explain this effect in terms of a noncollinear spin density induced by the substrate, which in our case is the spin spiral of the Mn monolayer on W(110). The two independent contrast channels, apparent height and shape, are identified with the Co magnetization projections onto two orthogonal axes. As a result, all components of the overall atom magnetic moment vector can be determined with a single spin-sensitive tip in the absence of an external magnetic field. This result should be general for any atom deposited on noncollinear magnetic layers. DOI: 10.1103/PhysRevB.93.125424The control of the spin degree of freedom down to the single-atom limit is nowadays a central research issue [1][2][3][4][5][6][7], fostered by the increasing need for miniaturization and lowering power consumption in communication technologies. The most suitable technique to address the problem is spinpolarized scanning tunneling microscopy (SP-STM) [8], which has proven to be an excellent tool to perform single-atom magnetometry [1,6]. The design of magnetic structures with a given functionality calls for atomic-scale engineering by means of atomic manipulation or self-assembly of lowdimensional structures. Both of them can be combined with SP-STM [6,7,9,10]. For that reason, getting insight into the underlying physics of SP-STM and extending its range of applications is of crucial relevance. The SP-STM principle is the magneto-conductance effect in magnetic tunnel junctions [8,[11][12][13][14], and relies on probing the imbalance between majority and minority spins in the local density of states (LDOS) with respect to a particular magnetic quantization axis. Following the same notation as in Ref. [15], the spinpolarized tunneling current at sample bias V readswhere ρ T and P T are the tip's density of states and spin polarization,ρ s andm s the integrated sample total density of states and magnetization at r (tip position), and θ the angle formed between the tip and local sample magnetization. As a consequence, a SP-STM tip is only sensitive to the projection onto its magnetization direction, m s cos θ , and not to all other components ofm s . Here we show that the situation is radically different if the substrate's magnetic ground state is noncollinear within the spatial extent of an atomic wave function. Owing to the breaking of translational symmetry in spin space associated with the noncollinearity, the atoms' apparent shapes become distorted in spin-resolved STM images. We find that the strength of such distortion provides a quantitative measurement of the total spin component orthogonal to the default sensitivity direct...

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Section: (D) and 2(e) Provided That P T = 0 And Aφ/w < 90mentioning

confidence: 99%

Spin-sensitive shape asymmetry of adatoms on noncollinear magnetic substrates

et al. 2016

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“…To reveal the local magnetic ordering, it is necessary to study Fe films with a method sensitive to atomic-scale magnetic structures. Spin-polarized scanning tunneling microscopy (SP-STM) is a suitable technique for studying complex magnetic structures, e.g, those showing zero magnetization (such as antiferromagnetic and non-collinear complex structures) with atomic resolution [3,[10][11][12]. We studied the structural and magnetic properties of Fe films grown on Rh (001) surfaces with low electron energy diffraction (LEED), scanning tunneling microscopy (STM), spin-polarized STM (SP-STM), and MOKE measurements.…”

Section: Introductionmentioning

confidence: 99%

A complex magnetic structure of ultrathin Fe films on Rh (001) surfaces

Takada

Gastelois

Przybylski

et al. 2013

Journal of Magnetism and Magnetic Materials

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“…A noncollinear spin density was observed by spin-polarized scanning tunneling microscopy on equiatomic NiMn films grown layer by layer on Cu͑001͒. 31 This finding deviates significantly from the expected collinear alignment and was interpreted by a surface reconstruction.…”

Section: Introductionmentioning

confidence: 91%

“…[17][18][19][20] In the last decade, several studies on NiMn were performed in the regime of thin and ultrathin films. [21][22][23][24][25][26][27][28][29][30][31] In an x-ray magnetic circular dichroism study of c͑2 ϫ 2͒ NiMn/ Ni͑001͒ an FM instead of an AFM order was observed and attributed to the lattice distortion. 23,24 An FM order has also been observed for Ni x Mn 100−x films on Cu͑001͒ with a Ni content x Ն 80.…”

Section: Introductionmentioning

confidence: 99%

Magnetic interface coupling between ultrathin Co andNixMn100−xfilms on Cu(001)

et al. 2010

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Growth and magnetic properties of Ni x Mn 100−x single and Co/ Ni x Mn 100−x bilayer films on Cu͑001͒ have been investigated by grazing ion scattering, Auger electron spectroscopy, low-energy electron diffraction, and magneto-optical Kerr effect. The increase in the coercivity field strength and the decrease in the signal strength of the hysteresis loop is used as a measure of the magnetic interface coupling in the bilayers. The strength of the antiferromagnetic/ferromagnetic interface coupling rapidly increases with increasing NiMn thickness. Above a critical NiMn thickness of about 8 ML, we observe the strongest interface coupling effects in the intermediate concentration regime with a Ni content 10Յ x Յ 40 at a temperature of T = 300 K and 5 Յ x Յ 50 for T = 133 K.

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Noncollinear Surface Spin Density by Surface Reconstruction in the Alloy NiMn

Cited by 29 publications

References 18 publications

Spin-sensitive shape asymmetry of adatoms on noncollinear magnetic substrates

Spin-sensitive shape asymmetry of adatoms on noncollinear magnetic substrates

A complex magnetic structure of ultrathin Fe films on Rh (001) surfaces

Magnetic interface coupling between ultrathin Co andNixMn100−xfilms on Cu(001)

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