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14 items found (0 items not approved), displaying 11 to 14.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published
I10-Beamline for Advanced Dichroism	Magnetic reversal in a YFe2 dominated DyFe2/YFe2 multilayer film G. B. G. Stenning , G. J. Bowden , S. A. Gregory , J.-m. L. Beaujour , P. A. J. De Groot , L. R. Shelford , P. Bencok , P. Steadman , A. N. Dobrynin , T. Hesjedal , G. Van Der Laan Applied Physics Letters 101 (7) DOI: 10.1063/1.4746749 Diamond Proposal Number(s): [716] Show Abstract ▼ Abstract: Magnetic reversal in a (110)-oriented [DyFe 2 (60?Å)/YFe 2 (240?Å)]×15 multilayerfilm is investigated using magnetometry, micro-magnetic modeling, and element-specific soft x-ray magnetic circular dichroism. At temperatures between ?60 and 120?K, the magnetic reversal involves a two-step process. It is shown that the reversal mechanism can be described as switching from an in-plane [001] reversed anti-ferromagnetic state, to an out-of-plane [100] transverse spring exchange state, and finally to an in-plane [001 ¯ ] magnetic exchange spring state.	Aug 2012
	Exchange bias in a Co/CoO/Co trilayer with two different ferromagnetic-antiferromagnetic interfaces A. N. Dobrynin , D. Givord Physical Review B 85 (1) DOI: 10.1103/PhysRevB.85.014413 Show Abstract ▼ Abstract: The exchange-bias properties of a Co/CoO/Co sandwich structure are examined. The Co/CoO bottom bilayer was obtained by oxidation of a Co layer and the top bilayer was formed by subsequent deposition of Co on top of CoO. The strength of the interfacial coupling is shown to be stronger at the bottom Co/CoO interface than at the top interface. A number of original properties characterize exchange bias of the top bilayer. This includes weak temperature dependence of the bias field, weak coercivity due to exchange bias, and lack of the training effect. These properties suggest that the antiferromagnetic moment configuration is frozen during magnetization reversal of the top Co layer.	Jan 2012
	Experimental determination of the magnetization dependent part of the demagnetizing field in hard magnetic materials A. N. Dobrynin , T. R. Gao , N. M. Dempsey , D. Givord Applied Physics Letters 97 (19) DOI: 10.1063/1.3514554 Show Abstract ▼ Abstract: A method for extracting the magnetization dependent part of the demagnetizing field from minor hysteresis loops is described. It applies to hard magnetic materials with irreversible magnetization switching. The method's validity is tested on the simulated magnetization curves of an assembly of hard magnetic grains, as well as on a thin NdFeB film with out of plane magnetization. Effective demagnetization factors are extracted from the analysis. These factors are smaller than the usually applied sample shape dependent demagnetizing factors. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3514554]	Nov 2010
	Influence of dipolar collective effects on coercivity and demagnetizing factors in hard magnetic materials A. N. Dobrynin , V. M. T. S. Barthem , F. Ingwiller , D. Givord Physical Review B 81 (17) DOI: 10.1103/PhysRevB.81.172403 Show Abstract ▼ Abstract: Magnetization reversal in systems made of high coercivity exchange-decoupled grains is modeled. Dipolar collective effects, negligible for a sample in the form of a foil with out-of-plane magnetization, become more and more significant as the sample shape evolves toward three-dimensional geometry, and reach their maximum in case of a foil with in-plane magnetization. These collective effects are manifested by coercivity variations, which allow differences in coercivity for samples of the same material but having different shapes to be understood. Taking collective effects into account requires the introduction of a correction term to the demagnetizing factor. The numerical results obtained are experimentally confirmed for NdFeB permanent magnets.	Jan 2010

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