Swift ion irradiations of natFe/57Fe/Si trilayers

Milinović, V.; Lieb, Klaus‐Peter; Sahoo, Pratap K.; Schaaf, Peter; Zhang, K.; Klaumünzer, S.; Weisheit, Martin

doi:10.1016/j.apsusc.2005.12.029

Cited by 8 publications

(13 citation statements)

References 20 publications

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“…No indication of crystalline iron-silicide phase formation was observed. This finding is in agreement with the Mössbauer effect and XRD data collected in various swift heavy ion irradiation experiments of Fe/Si bi-and multilayers [10,11,14,15], but in contrast to the results of Assmann et al [23], whoon the basis of CEMS -claimed that crystalline α-FeSi 2 was formed.…”

Section: Methodssupporting

confidence: 81%

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Ion Beam Mixing at Crystalline and Amorphous Fe/Si Interfaces

Milinović¹,

Zhang²,

Bibić³

et al. 2006

AIP Conference Proceedings

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This study presents an optimization and characterization of amorphous Iron Disilicide (a-FeSi 2) synthesized using Ion Beam Mixing (IBM) of Fe/Si multilayer structures. The layers were deposited using RF magnetron sputtering, and subsequently irradiated with Ar + and Fe + beams of 150 and 200keV. Rutherford Back Scattering (RBS) analysis was used to determine the structure and level of silicidation of the samples. The nature of the band-gap and the optical absorption coefficients were determined by optical transmission analysis. The results demonstrate that the synthesis of a-FeSi 2 can be achieved using this technique, with the total level of silicidation being highly dependant upon the initial structure configuration and beam parameters. Direct band-gap energies of ~0.90eV have been observed for those samples with the highest levels of silicidation, with optical absorption coefficients of ~10 4 cm-1. Therefore this method of fabrication has been shown to produce a-FeSi 2 layers without the need for post-synthesis treatment, using established technologies without compromising the optical properties that make this material such a promising semiconductor for the photovoltaics market.

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Section: Methodssupporting

confidence: 81%

“…Recently, the mixing studies of Fe/Si bilayers were extended to chemically active ions (nitrogen) [8], highly charged ions [6,9], and swift heavy ions with more than 100 MeV, i.e. in the regime of electronic stopping [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Ion Beam Mixing at Crystalline and Amorphous Fe/Si Interfaces

Milinović¹,

Zhang²,

Bibić³

et al. 2006

AIP Conference Proceedings

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“…At higher fluences, full interdiffusion gives rise to amorphous silicide phases, build-up of stress and loss of magnetic texture [286]. Similar kinds of studies were also done also by Milinovic and group [529]. Schottky barrier height calculation and series resistance values were reported before and after 120 MeV Au ion irradiation on Fe thin film on Si (111) substrate.…”

Section: Fe/simentioning

confidence: 68%

Ion beam induced surface and interface engineering

Jain

Agarwal

2011

Surface Science Reports

261

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“…MeV Au ions also lead to changes in magnetism and microstructure as recently observed in Fe/Si systems [22,23].…”

Section: -Introductionmentioning

confidence: 99%

High-energy ion beam irradiation of Co/NiFe/Co/Cu multilayers: Effects on the structural, transport and magnetic properties

et al. 2008

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The aim of this work is to investigate the effects of 593 MeV Au irradiation using two different projectile charges, namely Au 30+ and Au 46.3+ on the structural, transport and magnetization properties of Co/NiFe/Co/Cu multilayers. X-Ray diffraction and extended x-ray absorption fine structures measurements show no significant structural change for as deposited and irradiated multilayers. On the other hand, the magnetoresistance amplitude decreases with the ion fluence but it is insensitive to the projectile charge state.The correlation between changes in the magnetoresistance and remanent magnetization suggests that the main effect responsible for the decrease of the magnetoresistance is the creation of ferromagnetic pinholes. These results are discussed on basis of the electronic thermal spike model and nuclear cascades theory and show similarities to the effects observed at low-energy ion-beam irradiation.61.80.Jh, 75.70.Pa 1 I -IntroductionFast heavy ions may lead to permanent material changes in a small cylinder along the nearly straight ion path, giving rise to the so-called ion tracks. Different explanations for the basic mechanisms for the track production have been proposed [1][2][3][4][5][6][7][8][9], but all of them depend on the electronic ionization along the ion path and thus on the projectile charge. All these mechanisms may finally yield an unordered atomic motion and if a critical local lattice temperature is exceeded, permanent atomic rearrangement may result. The influence of the nuclear tracks has been widely studied in polymers, semiconductors and metallic glasses [10][11], but in much less extension for magnetic materials.Multilayer (ML) magnetic systems have been widely investigated since the discovery of the phenomenon of giant magnetoresistance (GMR) [12], because of their great potential for applications in magnetic recording technology [13]. In particular studies using low energy ions, where nuclear stopping power predominates, show that the ion bombardment can promote local atomic diffusion and modification of the magnetic properties of the target. For instance changes in the coercivity , uniaxial magnetic texture, interface mixing and phase transformation have been reported for Fe/Co systems [14][15][16][17]. Furthermore the suppression of exchange bias [18] and modification of the perpendicular interface anisotropy [19] have been observed by keV He ions irradiation.Also these low energy ions may be used to control of interlayer exchange coupling [20] and to induce chemical order in intermetallic alloys [21]. Swift ion irradiations with 350MeV Au ions also lead to changes in magnetism and microstructure as recently observed in Fe/Si systems [22,23]. 2The ion irradiation at low energies may increase the GMR in few cases (depending on the ion fluence) but mostly it leads to a degradation of the GMR [24][25][26][27].The observed reduction of the GMR and the partial loss of antiferromagnetic coupling were interpreted in terms of the creation of ferromagnetic pinholes. We have stu...

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Swift ion irradiations of natFe/57Fe/Si trilayers

Cited by 8 publications

References 20 publications

Ion Beam Mixing at Crystalline and Amorphous Fe/Si Interfaces

Ion Beam Mixing at Crystalline and Amorphous Fe/Si Interfaces

Ion beam induced surface and interface engineering

High-energy ion beam irradiation of Co/NiFe/Co/Cu multilayers: Effects on the structural, transport and magnetic properties

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