Structure and magnetic properties of MnSi epitaxial thin films

Karhu, Eric; Kahwaji, Samer; Monchesky, T. L.; Parsons, C.; Robertson, M.; Maunders, Christian

doi:10.1103/physrevb.82.184417

Cited by 83 publications

(128 citation statements)

References 48 publications

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“…Our study is consistent with the observation in the literature that the structure of dilute non-monotonic thickness dependence is observed for MnSi / Si(111) films, 22 and is explained in part by the results of DFT calculations that predict an enhanced interfacial moment. 36 The drop seen in the 2-and 3-ML films is then attributed in part to the formation of bulk moments, and due to the presence of defects, which possibly explain the decrease in the moment of MnSi / Si(111) films.…”

Section: Magnetic Propertiessupporting

confidence: 81%

“…In addition to the described samples, a 5-nm thick single crystal MnSi film was grown on Si(111) by solid phase epitaxy. 22 It served as a reference for MnSi-B20 structure and for the determination of XAFS parameters. XRR measurements provided information on the distribution of the buried Mn layer, the thickest and thinnest of which are shown in Fig.…”

Section: Film Growth and Structural Characterizationmentioning

confidence: 99%

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Local structure and magnetic properties of B2- and B20-like ultrathin Mn films grown on Si(001)

et al. 2012

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The structural and magnetic properties of ultrathin Mn layers deposited onto Si(001) by molecular beam epitaxy (MBE) at low temperature are reported. X-ray absorption fine structure (XAFS) studies reveal that the structure of the silicide layer that forms depends on the growth temperature of the capping layer. A capping layer grown at 200 ºC on 0.35 monolayer (ML) Mn results in a metastable MnSi phase with a B2-like (CsCl) structure, whereas a cap grown at room temperature on 0.5 ML followed by annealing at 200 °C produces a lower coordinated MnSi phase with a B20-like structure. Increasing the Mn thickness from 0.5 to 4 monolayers does not trigger a structural transformation but drives the structure closer to MnSi-B20. The sample with B2-like structure has the largest Mn magnetic moment of 0.33μ B /Mn at T=2 K, and a Curie temperature T C above 250 K.MnSi-B20 layers showed lower moments and much lower T C 's, in-line with those reported for MnSi-B20 thin films.2

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Section: Magnetic Propertiessupporting

confidence: 81%

Section: Film Growth and Structural Characterizationmentioning

confidence: 99%

Local structure and magnetic properties of B2- and B20-like ultrathin Mn films grown on Si(001)

et al. 2012

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“…In the low field regime, the calculated ground state helicoid yields a different spin asymmetry than the data. The presence of bi-chiral domains creates frustration at the grain boundaries that is responsible for the reported glassy behavior 30 . This frustration causes disorder in the phase of the helices in each grain.…”

Section: (A)mentioning

confidence: 99%

“…Although the differential SANS measurement removes the nuclear contribution from the signal, the grain boundaries imprint their structure on the magnetic texture. The skyrmion lattice phase possesses a net magnetization, as evidenced by PNR, and variations in the direction of the net magnetization of each grain arise in the sample due to the frustration at the grain boundaries 30 . These would be expected to contribute to Porod scattering.…”

Section: B Sansmentioning

confidence: 99%

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Neutron study of in-plane skyrmions in MnSi thin films

et al. 2017

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The magnetic structure of the in-plane skyrmions in epitaxial MnSi/Si(111) thin films is probed in three dimensions by the combination of polarized neutron reflectometry (PNR) and small angle neutron scattering (SANS). We demonstrate that skyrmions exist in a region of the phase diagram above at temperature of 10 K. PNR shows the skyrmions are confined to the middle of the film due to the potential well formed by the surface twists. However, SANS shows that there is considerable disorder within the plane indicating that the magnetic structure is a 2D skyrmion glass.

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Phase Selection in Mn–Si Alloys by Fast Solid‐State Reaction with Enhanced Skyrmion Stability

Xie

Yuan

et al. 2021

Adv Funct Materials

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B20‐type transition‐metal silicides or germanides are noncentrosymmetric materials hosting magnetic skyrmions, which are promising information carriers in spintronic devices. The prerequisite is to prepare thin films on technology‐relevant substrates with magnetic skyrmions stabilized at a broad temperature and magnetic‐field working window. A canonical example is the B20‐MnSi film grown on Si substrates. However, the as‐yet unavoidable contamination with MnSi1.7 occurs due to the lower nucleation temperature of this phase. In this work, a simple and efficient method to overcome this problem and prepare single‐phase MnSi films on Si substrates is reported. It is based on the millisecond reaction between metallic Mn and Si using flash‐lamp annealing (FLA). By controlling the FLA energy density, single‐phase MnSi or MnSi1.7 or their mixture can be grown at will. Compared with bulk MnSi, the prepared MnSi films show an increased Curie temperature of up to 41 K. In particular, the magnetic skyrmions are stable over a much wider temperature and magnetic‐field range than reported previously. The results constitute a novel phase selection approach for alloys and can help to enhance specific functional properties, such as the stability of magnetic skyrmions.

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Structure and magnetic properties of MnSi epitaxial thin films

Cited by 83 publications

References 48 publications

Local structure and magnetic properties of B2- and B20-like ultrathin Mn films grown on Si(001)

Local structure and magnetic properties of B2- and B20-like ultrathin Mn films grown on Si(001)

Neutron study of in-plane skyrmions in MnSi thin films

Phase Selection in Mn–Si Alloys by Fast Solid‐State Reaction with Enhanced Skyrmion Stability

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