Ferro- and Antiferromagnetic Spin Arrangements in F.C.C. Rh-Fe Alloys

Parfenova, V. P.; Delyagin, N.N.; Erzinkyan, A. L.; Reyman, S.I.

doi:10.1002/(sici)1521-3951(199907)214:1<r1::aid-pssb99991>3.0.co;2-c

Cited by 5 publications

(9 citation statements)

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“…The rhodium-rich FCC phase exhibits competing ferro-and antiferromagnetic local spin configurations behaving as a spin glass [11]. Introduction of Fe into Pd results in a giant magnetic moment, where a large atomic moment of Fe is maintained in addition to the induced ferromagnetic polarization of the surrounding Pd atoms [12 and references therein].…”

Section: Introductionsupporting

confidence: 83%

The Electronic and Magnetic Properties of FCC Iron Clusters in FCC 4D Metals

et al. 2005

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The electronic and magnetic structures of small FCC iron clusters in FCC Rh, Pd and Ag were calculated using the discrete variational method as a function of cluster size and lattice relaxation. It was found that unrelaxed iron clusters, remain ferromagnetic as the cluster sizes increase, while for relaxed clusters antiferromagnetism develops as the size increases depending on the host metal. For iron in Rh the magnetic structure changes from ferromagnetic to antiferromagnetic for clusters as small as 13 Fe atoms, whereas for Fe in Ag antiferromagnetism is exhibited for clusters of 24 Fe atoms. On the hand, for Fe in Pd the transition from ferromagnetism to antiferromagnetism occurs for clusters as large as 42 Fe atoms. The difference in the magnetic trends of these Fe clusters is related to the electronic properties of the underlying metallic matrix. The local d densities of states, the magnetic moments and hyperfine parameters are calculated in the ferromagnetic and the antiferromagnetic regions. In addition, the average local moment in iron-palladium alloys is calculated and compared to experimental results.Key words magnetic moment · hyperfine fine field · isomer shift · density of states · impurity · cluster · 4d host · iron.

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Section: Introductionsupporting

confidence: 83%

The Electronic and Magnetic Properties of FCC Iron Clusters in FCC 4D Metals

et al. 2005

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“…In order to transform the hyperfine field shifts, obtained from fitting results, into the magnetic moment shifts Dm Fe (n Pd ), we used Eq. (1) with the parameters a ¼ 8.1 T/m B and b ¼ 0.5 T/m B , which were found earlier [1,2]. The magnetic moment of a particular number of n.n.…”

Section: Magnetic Ordering Temperaturesmentioning

confidence: 62%

“…In previous papers [1,2] we have reported on the results of Mö ssbauer investigations of magnetically ordered fcc Rh 1--x Fe x alloys with 0.1 x 0.3. These alloys were discovered to have an unusual magnetic spin structure consisting of randomly distributed ferro-and antiferromagnetic local spin configurations.…”

Section: Introductionmentioning

confidence: 99%

“…These alloys were discovered to have an unusual magnetic spin structure consisting of randomly distributed ferro-and antiferromagnetic local spin configurations. It was suggested [1,2] that this spin structure arises from the competition between two opposite in sign exchange interactions: antiferromagnetic coupling between nearest-neighbor (n.n.) Fe atoms and ferromagnetic exchange interaction with the rhodium matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Within this context, in this paper, we present the results of Mö ssbauer study of the magnetic hyperfine interaction for 57 Fe in the magnetically ordered fcc (Rh 1--x Pd x ) 0.9 Fe 0.1 alloys with 0 x 1. The iron concentration in these alloys corresponds to the minimal one used in previous investigations of Rh-Fe system [1,2]. Mö ssbauer spectroscopy is a powerful method for studying magnetic systems with complicated magnetic structure.…”

Section: Introductionmentioning

confidence: 99%

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Local Spin Configurations and Magnetic Ordering in Competing-Exchange System (Rh, Pd)90Fe10

Parfenova

Erzinkyan

Delyagin

et al. 2001

phys. stat. sol. (b)

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Mö ssbauer spectroscopy technique has been used to investigate the evolution of the hyperfine field distributions and the local spin configurations of Fe atoms in the magnetically ordered (Rh 1--x Pd x ) 0.9 Fe 0.1 alloys over the concentration range 0x 1. In the whole composition range, the magnetic behavior of the alloys is governed by the competition between two exchange interactions opposite in sign: the direct antiferromagnetic coupling between the nearest-neighbor Fe atoms and the ferromagnetic interaction due to the matrix polarization. For Rh-rich alloys, this leads to a spin-glass-like magnetic structure, where the ferro-and antiferromagnetic local spin configurations are realized with nearly equal probabilities. For the concentration range x 0.3, the magnetic ordering temperature is equal to about 32 K independent of the Pd concentration. In the same concentration range, a sharp increase of the magnetic moment of Fe atoms was observed. The severe influence of rhodium on the Curie temperature of the ferromagnetic PdFe alloy is explained by the spin reorientation effect, leading to a destruction of the ferromagnetic spin structure. The strong diffuseness of the magnetic transition in the intermediate concentration range 0.4 < x < 0.8 is due to the presence of Fe sites with both Rh-rich and Pd-rich local environments.

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Magnetism of iron in face‐centered cubic 4d metals

Elzain

Rawas

Yousif

et al. 2004

phys. stat. sol. (c)

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PACS 75.50.Bb The magnetic moments and hyperfine fields at iron sites embedded in Rh, Pd and Ag face centered cubic structures were calculated using the first principle discrete variational method (DVM) and the fullpotential linear-augment plane wave (FP-LAPW) method. In DVM the systems were represented by, clusters of atoms, while in FP-LAPW supercells were used. The objectives of this work are to compare and contrast results from the two different computational methods in addition to comparison to experimental data. Large magnetic moments were obtained for iron in Pd, relatively smaller moments for iron in Ag and smaller moments for iron in Rh. Iron atoms were found to couple ferromagnetically to Pd atoms and antiferromagnetically to Rh. No moment is induced on the Ag atom.

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Ferro- and Antiferromagnetic Spin Arrangements in F.C.C. Rh-Fe Alloys

Cited by 5 publications

References 3 publications

The Electronic and Magnetic Properties of FCC Iron Clusters in FCC 4D Metals

The Electronic and Magnetic Properties of FCC Iron Clusters in FCC 4D Metals

Local Spin Configurations and Magnetic Ordering in Competing-Exchange System (Rh, Pd)90Fe10

Magnetism of iron in face‐centered cubic 4d metals

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