Structural and magnetic phase transitions of Fe on stepped Cu(111)

Shen, Jianxin; Klaúa, M.; Ohresser, P; Jenniches, H.; Barthel, J.; Mohan, Ch. V.; Kirschner, J.

doi:10.1103/physrevb.56.11134

Cited by 109 publications

(84 citation statements)

References 27 publications

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“…The magnetic order of thin Fe films on Cu(111) has been under debate for quite some time because of the nonlinear increase of the magnetization with increasing thickness and the strong influence of the deposition method on the measured magnetic response [48,49,50]. The lack of knowledge of the crystallographic structure lead to multiple hypotheses, e.g.…”

Section: Magnetic Order Of 2 ML Fe/cu(111)mentioning

confidence: 99%

Magnetoelectric coupling at metal surfaces

et al. 2010

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Section: Magnetic Order Of 2 ML Fe/cu(111)mentioning

confidence: 99%

Magnetoelectric coupling at metal surfaces

et al. 2010

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“…The chemical contrast is given by (I + + I − )/2. In conventional step decoration processes, the stripes have a height comparable to that of mono-atomic steps [2,3,12]. FIG.…”

mentioning

confidence: 99%

Nanometers-thick self-organized Fe stripes: bridging the gap between surfaces and magnetic materials

Fruchart

Eleoui

Vogel

et al. 2004

Applied Physics Letters

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We have fabricated 5 nm-high Fe(110) stripes by self-organized (SO) growth on a slightly vicinal R(110)/Al203(1120) surface, with R=Mo, W. Remanence, coercivity and domain patterns were observed at room temperature (RT). This contrasts with conventional SO epitaxial systems, that are superparamagnetic or even non-magnetic at RT due to their flatness. Our process should help to overcome superparamagnetism without compromise on the lateral size if SO systems are ever to be used in applications.Arrays of epitaxial nanometer-sized (1-50 nm) magnetic structures can be grown by self-organization (SO). However such structures are superparamagnetic or even non-magnetic at room temperature (RT) [1,2,3]. Indeed the energy barrier opposing spontaneous magnetization flipping roughly scales with KV , with K the magnetic anisotropy per unit volume, and V the system's volume. 3D clusters of similar lateral size can overcome superparamagnetism at RT by increasing K[4]. This seems not sufficient in epitaxial SO [3,5,6] because SO deposits are generally very flat, implying a very small V . Therefore, beating superparamagnetism in SO deposits without compromising on the lateral density seems to imply increasing their thickness t.One way to force SO deposits to grow vertically and overcome superparamagnetism at RT is sequential deposition [7,8]. We proposed a second route, that consists in annealing a thin continuous film deposited on a vicinal surface to form an array of several atomic layers (AL)-thick stripes [8,9]. In the early reports, concerning Fe/Mo(110) stripes, a stable thickness t = 6 AL (∼ 1.2 nm) was observed above 1-2 ALs of wetting. Yet this was not thick enough to observe static coercivity at RT, which could be obtained only for multidisperse assemblies of islands and stripes, thicker on the average. In this Letter we report the growth of thicker stripes, in the case of Fe/W(110): t ∼ 25 AL (∼ 5 nm). Such stripes display at RT functional features of magnetic materials: coercivity, remanence and domains, unlike conventional SO systems. The microscopic origin of the self-organization process is also unravelled.The samples are epitaxially grown by pulsed laser deposition in a multi-chamber ultra-high vacuum setup (base pressure 7 × 10 −9 Pa), with in situ STM, RHEED and Auger spectroscopy [10]. Commercial (1120) sapphire wafers with a residual miscut angle ǫ < 0.1 • are buffered with refractory metal films (Mo or W, < ∼ 10 nm-thick), whose surface consists of an array * Olivier.Fruchart@grenoble.cnrs.fr of atomically-flat terraces of width ∼ 200 nm, separated by mono-atomic steps [9]. Fe is then deposited at 150 • C and annealed at 400 − 450 • C, covered with 1 nm Mo for controlling the magnetic anisotropy, and finally capped by 4 nm Al as a protection against oxidation. AFM (PSI Autoprobe CP) and hysteresis loops (QD MPMS-XL) were performed ex situ. Samples were then dc-demagnetized ex situ with the field applied perpendicular to the stripes. Magnetic and chemical imaging was performed under zero external field using ...

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“…[1][2][3][4][5][6][7][8] Quantum beam technologies, such as ion beams 1,2 and lasers, [9][10][11][12][13][14][15][16][17] have often been used for the efficient development of nanostructured materials. Lasers, in particular, are expected to serve as an increasingly useful tool for obtaining nanostructured materials because nanostructured surface morphologies can be fabricated by laser irradiation [9][10][11][12][13][14] and laser-assisted direct imprinting.…”

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confidence: 99%

Nanopatterns induced by pulsed laser irradiation on the surface of an Fe-Al alloy and their magnetic properties

Yoshida

Oosawa

Watanabe

et al. 2013

Applied Physics Letters

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We have studied nanopatterns induced by nanosecond pulsed laser irradiation on (111) plane surfaces of a polycrystalline iron-aluminum alloy and evaluated their magnetic properties. Multiple nanosecond pulsed laser irradiation induces a wavelength-dependent surface transformation of the lattice structure from a B2-type to a supersaturated body centered cubic lattice. The selective formation of surface nanopatterns consisting of holes, stripes, polygonal networks, and dot-like nanoprotrusions can be observed. Furthermore, focused magneto-optical Kerr effect measurements reveal that the magnetic properties of the resultant nanostructured region changes from a paramagnetic to a ferromagnetic phase in accordance with the number of laser pulses

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Structural and magnetic phase transitions of Fe on stepped Cu(111)

Cited by 109 publications

References 27 publications

Magnetoelectric coupling at metal surfaces

Magnetoelectric coupling at metal surfaces

Nanometers-thick self-organized Fe stripes: bridging the gap between surfaces and magnetic materials

Nanopatterns induced by pulsed laser irradiation on the surface of an Fe-Al alloy and their magnetic properties

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