Ultrathin Fe layers on Ag (100) surface

Dézsi, I.; Fetzer, Cs.; Szücs, I. S.; Degroote, B.; Vantomme, André; Kobayashi, Takayuki; Nakanishi, A.

doi:10.1016/j.susc.2007.04.202

Cited by 12 publications

(7 citation statements)

References 41 publications

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“…The IS = 0.22 mm/s value and the broadly distributed magnetic field for the sample of MgO/9 ML 56 Fe/1 ML 57 Fe/Ag/Si could be attributed to 57 Fe atoms in the Fe-Ag interface and having Ag neighboring atoms. The IS value is the same as was measured in ultrathin Ag/Fe/Ag trilayer [28]. These results indicate no significant atomic interdiffusion between the iron layers on MgO.…”

Section: Discussionsupporting

confidence: 82%

The interaction of Fe on MgO(100) surfaces

et al. 2009

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Section: Discussionsupporting

confidence: 82%

The interaction of Fe on MgO(100) surfaces

et al. 2009

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“…For x = 5 and 10, the measured spectra agree within the experimental errors and can be described by a slightly broadened [ = 0.41 1 interfaces, 13,28,29 and beyond the broadening of the crystalline sextet they might contribute in a small extent to the high field components (above 30 T) of the HF distribution. The broad HF distribution with HF = 18.8(2) T and IS = 0.26(2) mm/s average values is attributed to the amorphous B/Fe interfaces.…”

Section: Results and Discussion Of B/fe/ag Multitrilayer Samplessupporting

confidence: 71%

Top and bottom interfaces in Fe-B multilayers investigated by Mössbauer spectroscopy

et al. 2012

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Mössbauer spectroscopy is frequently applied to gain information on the interfaces in multilayers, and recently the layer sequence permutation of multitrilayers was suggested to enhance its capability to characterize bottom and top interfaces of a given layer. The sequence permutation, however, in the investigated Fe-BAg multitrilayers affected the waviness of the layers as well, and the results hinted at the possibility that although Ag does not mix with Fe and B, the Fe-B amorphous alloy formation is influenced by the layer-sequence-dependent morphology of the Ag layers in the multitrilayers. Now we examine the interface mixing of Fe and B in the case of a fixed layer sequence and varying thickness of the Ag layers in [2 nm B/2 nm Fe/x nm Ag] 4 , 0.2 x 10, multitrilayer samples and in B/Fe/B and B/Fe/Ag trilayers. Below x = 5 nm, both the ratio of the nonalloyed Fe layer and the average hyperfine field of the amorphous Fe-B interface compound change. The variation is attributed to thickness-dependent discontinuities of the Ag layers. Ag acts as a barrier to the diffusion of B from the top side and thus the discontinuities lead to a varying ratio of top and bottom interfaces. The evaluation based on this model shows that the "B on top of Fe" interface has an average B concentration about 11 at. % higher than the "Fe on top of B" interface. A slightly smaller difference, 6 at. %, is deduced from low-temperature conversion electron Mössbauer spectroscopy measurements of the trilayers.

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“…1) can be attributed to an about 10-20% of the Fe atoms forming smaller grains with T B below room temperature.The direction of the spontaneous magnetization changes from in plane to out of plane at around x = 0.6. This finding is qualitatively in agreement with results on samples prepared under different experimental conditions [1][2][3]. The magnetic anisotropy of multilayers can be affected by many different contributions [4].…”

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Perpendicular anisotropy in Fe/Ag multilayers

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Fetzer

Kaptás

et al. 2008

Physica Status Solidi (a)

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Ag(2.6 nm)/Fe(x nm)] 10 multilayers (0.2 ≤ x ≤ 1) have been prepared on Si(111) substrate by vacuum evaporation of 57 Fe enriched iron from a heated tungsten crucible in a base pressure of 10 -7 Pa. Ag was deposited by electron beam from a cold copper crucible. For ex-situ transmission Mössbauer spectroscopy measurements the samples were capped with a thick capping layer (55 nm Ag and 100 nm B). The deposited layers were removed from the substrate by using scotch tape. Field cooled (FC) and zero field cooled (ZFC) magnetization curves were measured by a superconducting quantum interference device (SQUID) magnetometer.The samples show superparamagnetic behavior in the whole Fe thickness range. This is indicated by the deviation of the FC and ZFC magnetization curves, as shown in Fig. 1 for a few representative samples. The blocking temperature, as defined by the temperature of the maximum in the ZFC magnetization, is 34 K for x = 0.2 (well reproducing the value of Ref. [2]) and rapidly increases with increasing x until x = 0.5. The broadening of the distribution of the size of the superparamagnetic grains with increasing x can also be inferred from the ZFC curves. Samples with x ≥ 0.6 are also superparamagnetic, as it is indicated by infield Mössbauer measurements not shown here, but for the majority of the Fe atoms the blocking temperature (T B ) is well above room temperature. The low temperature anomaly of the FC-ZFC curves of these samples (for x = 0.7 see Fig. 1) can be attributed to an about 10-20% of the Fe atoms forming smaller grains with T B below room temperature.The direction of the spontaneous magnetization changes from in plane to out of plane at around x = 0.6. This finding is qualitatively in agreement with results on samples prepared under different experimental conditions [1][2][3]. The magnetic anisotropy of multilayers can be affected by many different contributions [4]. For example the density and the orientation of the Ag steps of the growing superlattice were shown [5] to influence the direction of the magnetization. Our preliminary results on granular alloys prepared by co-evaporation of the elements indicate an in plane magnetization in a Fe concentration range equivalent to the present multilayer samples. In case of our multilayers the observed epitaxial growth [6] can explain the appearance of perpendicular magnetic anisotropy, since the coherent growth of the layers involves the presence of strains even in case of a small lattice mismatch. The transition from coherent to incoherent growth modes with increasing Fe layer thickness decreases the strain and can be accompanied by a change of the magnetic anisotropy direction [4].The direction of the spontaneous magnetization changes from out of plane to in plane at around x = 0.6 in [Ag(2.6 nm)/ Fe(x nm)] 10 multilayers (0.2 ≤ x ≤ 1) prepared on Si(111) substrate by vacuum evaporation. Transmission Mössbauer spectroscopy measurements of removed samples with a thick capping layer are compared to conversion electron Mössbauer spectroscopy meas...

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Ultrathin Fe layers on Ag (100) surface

Cited by 12 publications

References 41 publications

The interaction of Fe on MgO(100) surfaces

The interaction of Fe on MgO(100) surfaces

Top and bottom interfaces in Fe-B multilayers investigated by Mössbauer spectroscopy

Perpendicular anisotropy in Fe/Ag multilayers

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