Growth and magnetic domain structure of ultrathin Fe films on Rh(001)

Kemmer, Jeannette; Wilfert, Stefan; Kügel, Jens; Mauerer, Tobias; Hsu, Pin-Jui; Bode, Matthias

doi:10.1103/physrevb.91.184412

Cited by 9 publications

(9 citation statements)

References 43 publications

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“…However, the Ir(001) surface exhibits a (5 × 1) reconstruction which makes the preparation of a pseudomorphic Fe monolayer on Ir(001) difficult [50][51][52] . On the other hand, pseudomorphic growth of Fe on Rh(001) has been demonstrated experimentally and an antiferromagnetic checkerboard ground state has been observed 53 in agreement with theoretical predictions 43,44 .…”

Section: Introductionsupporting

confidence: 82%

Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

et al. 2017

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We study the magnetic interactions in atomic layers of Fe and 5d transition-metals such as Os, Ir, and Pt on the (001) surface of Rh using first-principles calculations based on density functional theory. For both stackings of the 5d-Fe bilayer on Rh(001) we observe a transition from an antiferromagnetic to a ferromagnetic nearest-neighbor exchange interaction upon 5d band filling. In the sandwich structure 5d/Fe/Rh(001) the nearest neighbor exchange is significantly reduced. For FeIr bilayers on Rh(001) we consider spin spiral states in order to determine exchange constants beyond nearest neighbors. By including spin-orbit coupling we obtain the Dzyaloshinskii-Moriya interaction (DMI). The magnetic interactions in Fe/Ir/Rh(001) are similar to those of Fe/Ir(001) for which an atomic scale spin lattice has been predicted. However, small deviations between both systems remain due to the different lattice constants and the Rh vs. Ir surface layers. This leads to slightly different exchange constants and DMI and the easy magnetization direction switches from out-of-plane for Fe/Ir(001) to in-plane for Fe/Ir/Rh(001). Therefore a fine tuning of magnetic interactions is possible by using single 5d transition-metal layers which may allow to tailor antiferromagnetic skyrmions in this type of ultrathin films. In the sandwich structure Ir/Fe/Rh(001) we find a strong exchange frustration due to strong hybridization of the Fe layer with both Ir and Rh which drastically reduces the nearest-neighbor exchange. The energy contribution from the DMI becomes extremely large and DMI beyond nearest neighbors cannot be neglected. We attribute the large DMI to the low coordination of the Ir layer at the surface. We demonstrate that higherorder exchange interactions are significant in both systems which may be crucial for the magnetic ground state.

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Section: Introductionsupporting

confidence: 82%

Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

et al. 2017

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“…Clean Rh(111) was prepared similarly to Rh(001) [16,17]. Fe films were deposited from e-beam evaporators at p < 3 × 10 −10 mbar with the substrate held at T S ¼ ð500 AE 10Þ K. We used two homebuilt lowtemperature STMs (T ≈ 5 K), one of which is equipped with a superconducting magnet with a maximal magnetic field μ 0 H ¼ 3 T oriented along the sample's surface normal.…”

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confidence: 99%

Magnetic Ground State Stabilized by Three-Site Interactions: Fe/Rh(111)

et al. 2018

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We report the direct observation of a theoretically predicted magnetic ground state in a monolayer Fe on Rh(111), which is referred to as an up-up-down-down (↑↑↓↓) double-row-wise antiferromagnetic spin structure, using spin-polarized scanning tunneling microscopy. This exotic phase, which exists in three orientational domains, is revealed by experiments with magnetic probe tips performed in external magnetic fields. It is shown that a hitherto unconsidered four-spin-three-site beyond-Heisenberg interaction distinctly contributes to the spin coupling of atoms with S≥1 spins. The observation of the ↑↑↓↓ order substantiates the presence of higher-order, in particular, three-site interactions, in thin magnetic films of itinerant magnets.

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“…The structures observed are often labyrinth-like and display two or more phases each existing in mesoscopic or macroscopic regions [1,3,5]. That is, they are more like the glass-like structures generated by the dynamical transition that occurs at K = −0.5 than like the equilibrium ordered phase patterns corresponding to the ground states.…”

Section: Summary and Discussionmentioning

confidence: 96%

“…Such systems include garnet films [1], ultra-thin magnetic systems [2], and fluid layers exhibiting nano-phase separation [3]. The interest in these systems is further driven by the continued evolution of experimental methods that allow the microscopic characterization of both equilibrium and non-equilibrium properties of such systems, and offer the possibility of manipulation of the pattern structures [3][4][5][6][7].…”

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confidence: 99%

The role of long relaxation times in a simple model with massless modes

Timmons

De’Bell

2018

Can. J. Phys.

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The next-nearest-neighbour Ising model with competing nearest-neighbour (nn) and next-nearest-neighbour (nnn) interactions, provides an example of a system in which massless modes destroy order at any finite temperature. This occurs only at a critical ratio, Kc, of the nnn and nn interactions. In this paper we investigate the role of long relaxation times in determining the behaviour of the system when the ratio of the nnn and nn interactions, K, is at and close to this critical ratio. Despite the absence of an order–disorder transition in systems with K = Kc, in Monte Carlo simulations reported here the temperature-dependent behaviour of the relaxation times indicates the existence of a glass transition with a glass transition temperature of Tg ≈ 0.26 in a model with nn interaction J = kB = 1.

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Growth and magnetic domain structure of ultrathin Fe films on Rh(001)

Cited by 9 publications

References 43 publications

Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

Dzyaloshinskii-Moriya interaction at an antiferromagnetic interface: First-principles study of Fe/Ir bilayers on Rh(001)

Magnetic Ground State Stabilized by Three-Site Interactions: Fe/Rh(111)

The role of long relaxation times in a simple model with massless modes

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