Sensitivity of magnetic X-ray dichroism for chemical order in MBE-grown FEPD layers

Kamp, P.; Belakhovsky, M.; Boeglin, C.; Dürr, H. A.; Laan, G. van der; Schille, P; Rogalev, A.; Goulon, J.; Gehanno, V.; Marty, A.; Gilles, B.

doi:10.1016/s0921-4526(98)00218-x

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…The possibility of alloying between Fe and Pd in fact provides further motivation for investigating Pd as a matrix material for Fe nanoparticles. It is of course known that single atom Fe impurities in Pd [38,39], as well as Fe atoms in Fe x Pd 1−x alloys [40][41][42][43][44][45][46], have atomic moments that are significantly enhanced compared to those in bcc bulk Fe due to Fe 3d-Pd 4d hybridization and exchange interactions. Also well established is the fact that, although non-magnetic in bulk form, Pd atoms in such systems can order ferromagnetically [39,40].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Baker¹,

Lees²,

Roy³

et al. 2013

J. Phys.: Condens. Matter

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We have investigated atomic structure and magnetism in Fe nanoparticles with a diameter of 2 nm embedded in a Pd matrix. The samples for these studies were prepared directly from the gas phase by co-deposition, using a gas aggregation source and an MBE-type source for the Fe nanoparticles and Pd matrix respectively. Extended absorption fine structure (EXAFS) measurements indicate that there is an appreciable degree of alloying at the nanoparticle/matrix interface; at dilute nanoparticle concentrations, more than half of the Fe atoms are alloyed with Pd. This leads to a core/shell structure in the embedded nanoparticles, with an FexPd1-x shell surrounding a reduced pure Fe core. Magnetism in the nanocomposite samples was probed by means of magnetometry measurements, which were interpreted in the light of their atomic structure. These point to a magnetized cloud of Pd atoms surrounding the embedded nanoparticles which is significantly larger than around single Fe atoms in Pd. The coercivities in the Fe/Pd nanocomposite samples are larger than in FexPd1-x atomic alloys of corresponding composition, which is consistent with exchange coupling between the magnetically harder and softer regions in the nanocomposite samples.

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Section: Introductionmentioning

confidence: 99%

Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Baker¹,

Lees²,

Roy³

et al. 2013

J. Phys.: Condens. Matter

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“…Regarding the growth of FePd directly on MgO͑001͒, molecular beam epitaxy ͑MBE͒ has been the most commonly used deposition technique. [16][17][18][19] For example, Kamp et al 19 studied the chemical ordering and morphology of FePd alloys deposited at temperatures ranging from room temperature ͑RT͒ up to 510°C, obtaining a maximum value of S = 0.91 at 350°C. A comparison between the structure and the magnetic properties of systems fabricated using different deposition techniques, such as MBE and sputtering, is of special interest for technological applications, considering that these two techniques involve different energies thus affecting the growth mode, and sputtering might be preferred for industrial fabrication of high anisotropy binary alloys for new storage media.…”

Section: Introductionmentioning

confidence: 99%

Temperature and thickness dependence at the onset of perpendicular magnetic anisotropy inFePdthin films sputtered onMgO(001)

Clavero¹,

García-Martín²,

Kramer³

et al. 2006

Phys. Rev. B

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The onset of chemical order ͑L1 0 phase͒ and perpendicular magnetic anisotropy in FePd͑001͒ thin films sputtered on MgO͑001͒ at temperatures from room temperature to 700°C and thickness between 1.4 and 22 nm are investigated. It is found that the formation of the FePd ordered phase exhibiting high perpendicular magnetic anisotropy ͑L1 0 phase with the c axis in the growth direction͒ is affected by a two-dimensional to three-dimensional growth mode transition with increasing deposition temperatures, hindering higher chemical ordering at moderate and high temperatures. For 22-nm-thick films, the ordered phase is only obtained in a narrow range of growth temperature centered at 450°C. This fact, together with strong surface morphology dependence on the deposition temperature, determines the magnetic and magneto-optical properties of the studied system. No dependence of the ordering degree on film thickness is found for films with thicknesses of 3, 7 and 22 nm grown at 450°C, with a constant value indicating that chemical ordering occurs since the early stages of growth and does not improve as the growth proceeds. The samples consist of chemically ordered nanostructures that range in size from 30 to 200 nm average diameter and 0.5-30 nm height as the film becomes thicker, and exhibit perpendicular magnetic anisotropy indicating that the c axis is parallel to the direction of growth. The largest coercive field ͑7 kOe͒ corresponds to the sample with nano-sized particles, and the coercivity drastically decreases down to 1 kOe as percolation sets in.

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Field Induced Magnetic Circular Dichroism in Paramagnetic Solids

Ebert¹,

Deng²,

Freyer³

2001

Magnetism and Synchrotron Radiation

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Sensitivity of magnetic X-ray dichroism for chemical order in MBE-grown FEPD layers

Cited by 7 publications

References 6 publications

Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Temperature and thickness dependence at the onset of perpendicular magnetic anisotropy inFePdthin films sputtered onMgO(001)

Field Induced Magnetic Circular Dichroism in Paramagnetic Solids

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Sensitivity of magnetic X-ray dichroism for chemical order in MBE-grown FEPD layers

Cited by 7 publications

References 6 publications

Structure and magnetism in Fe/FexPd1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Structure and magnetism in Fe/FexPd1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Temperature and thickness dependence at the onset of perpendicular magnetic anisotropy inFePdthin films sputtered onMgO(001)

Field Induced Magnetic Circular Dichroism in Paramagnetic Solids

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Product

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Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles

Structure and magnetism in Fe/Fe_xPd_1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles