Ion-beam-induced magnetic transformation of CO-stabilized fcc Fe films on Cu(100)

Zaman, Sameena Shah; Oßmer, Hinnerk; Jonner, Jakub; Novotný, Zbyněk; Buchsbaum, Andreas; Schmid, Michael; Варга, П.

doi:10.1103/physrevb.82.235401

Cited by 7 publications

(13 citation statements)

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“…2 nm transform spontaneously to bcc 12 . It is possible to overcome this thickness limit by stabilizing the fcc phase either by depositing the Fe at increased CO background pressure 14,15 or by alloying with Ni 16 . In this work we use 8-nm-thick Ni-stabilized fcc Fe films as nonmagnetic template and study the influence of FIB parameters on the structural and magnetic properties of transformed patterns.…”

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confidence: 99%

Research Update: Focused ion beam direct writing of magnetic patterns with controlled structural and magnetic properties

et al. 2018

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Focused ion beam irradiation of metastable Fe78Ni22 thin films grown on Cu(100) substrates is used to create ferromagnetic, body-centered-cubic patterns embedded into paramagnetic, face-centeredcubic surrounding. The structural and magnetic phase transformation can be controlled by varying parameters of the transforming gallium ion beam. The focused ion beam parameters as ion dose, number of scans, and scanning direction can be used not only to control a degree of transformation, but also to change the otherwise four-fold in-plane magnetic anisotropy into the uniaxial anisotropy along specific crystallographic direction. This change is associated with a preferred growth of specific crystallographic domains. The possibility to create magnetic patterns with continuous magnetization transitions and at the same time to create patterns with periodical changes in magnetic anisotropy makes this system an ideal candidate for rapid prototyping of a large variety of nanostructured samples. Namely spin-wave waveguides and magnonic crystals can be easily combined into complex devices in a single fabrication step.Direct writing of magnetic patterns by focused ion beam (FIB) irradiation 1 presents a favorable alternative to the conventional lithography approaches. It removes the need for further processing of the specimen and allows for a rapid prototyping of a large variety of nanostructured samples. Since the pioneering work of Chappert et al. 2 , many different approaches to ion-beam-induced magnetic patterning have been studied, including modification of magnetic anisotropies 2 , coercivity, exchange bias 3 or the magnetization of the

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Research Update: Focused ion beam direct writing of magnetic patterns with controlled structural and magnetic properties

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“…5(b)] shows dark and bright areas, very similar to the previous results with uniform irradiation of the films, with a width of the bright bcc areas between 5 and 15 nm. 28 As described previously, 28 the dark areas between and around the bright bcc areas are not fcc, but also bcc, as evidenced by the wedge-like structures typical for the Pitsch orientation of bcc Fe [Fig. 5(c)].…”

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confidence: 55%

“…bcc transformation. We have discussed previously that ion-induced nucleation of a bcc nucleus is a very rare event, 28 which clearly rules out nucleation of new bcc nuclei by stray ions. The situation may be different for growth of already existing nuclei, however: previous experiments have shown bcc needles with % 400 nm length already at an ion dose of 1.9 Â 10 13 cm À2 .…”

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confidence: 99%

“…Figure 5(a) shows an STM image of the 22-ML Fe film stabilized in the fcc phase 25,26 by growth in 6.7 Â 10 À10 mbar CO and irradiated through the mask with 2 keV Ar þ ions. 28 Again, we have chosen the optimum energy for the fcc ! bcc transformation of these films; the ion dose of 1.0 Â 10 15 cm À2 was almost twice the saturation dose.…”

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confidence: 99%

“…bcc (and, hence, paramagnetic ! ferromagnetic) transformation of the range-II films can be induced by Ar þ ion irradiation for both 8-ML films grown in UHV 27 as well as 22-ML films stabilized by CO. 28 In these studies, we could not or only roughly explore the feasibility of this method for nanopatterning due to insufficient lateral resolution, and the lateral resolution of this magnetic nanopatterning technique using ions remains unexplored.…”

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In-situ magnetic nano-patterning of Fe films grown on Cu(100)

Zaman¹,

Dvořák²,

Ritter³

et al. 2011

Journal of Applied Physics

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Metastable paramagnetic face-centered cubic (fcc) Fe films grown on a Cu(100) single crystal at room temperature can be transformed to the ferromagnetic body-centered cubic (bcc) structure by ion irradiation. We have employed this technique to write small ferromagnetic patches by Ar þ irradiation through a gold coated SiN mask with regularly arranged 80-nm diameter holes, which was placed on top of the as-prepared fcc Fe films. Nanopatterning was performed on both 8-monolayer (ML) Fe films grown in ultrahigh vacuum as well as 22-ML films stabilized by dosing carbon monoxide during growth. The structural transformation of these nano-patterned films was investigated using scanning tunneling microscopy. In both 8 and 22-ML fcc Fe films, the bcc needles are found to protrude laterally out of the irradiated part of the sample, limiting the resolution of the technique to a few 10 nm. The magnetic transformation was confirmed by magnetic force microscopy.

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The Phase Control of Transition Metallic Elements via Facile Chemical and Physical Syntheses

Liu,

Qin,

Gao

et al. 2024

The Chemical Record

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The crystal phases of metals are important factors to tune the properties of metals, and therefore received extensive attention. Traditionally, phase control is performed within limited numbers of elements by harsh conditions, such as face‐centered cubic Fe by high temperature. This review summarizes most reports in metal phase control area, including elements of Fe, Co, Ni, Cu, Ru, Pd, Rh, Os and Au. For every metallic element, the facile phase control methods are systematically introduced, such as epitaxial growth, ball milling, chemical reduction, etc. Their corresponding applications and the mechanisms for phase control are thoroughly discussed.

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Ion-beam-induced magnetic transformation of CO-stabilized fcc Fe films on Cu(100)

Cited by 7 publications

References 65 publications

Research Update: Focused ion beam direct writing of magnetic patterns with controlled structural and magnetic properties

Research Update: Focused ion beam direct writing of magnetic patterns with controlled structural and magnetic properties

In-situ magnetic nano-patterning of Fe films grown on Cu(100)

The Phase Control of Transition Metallic Elements via Facile Chemical and Physical Syntheses

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