Magnetization reversal studies of continuous and patterned exchange biased NiFe/FeMn thin films

Mohanty, J.; Vandezande, Stijn; Brems, Steven; Bael, M. J. Van; Charlton, Timothy; Langridge, S.; Dalgliesh, R. M.; Temst, Kristiaan; Haesendonck, C. Van

doi:10.1007/s00339-012-7031-2

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…All samples have 1.5 nm of Au cap layer for oxidation protection. All samples were characterized by means of x-ray reflectivity and atomic force microscopy [15]. The x-ray reflectivity data indicate that the roughness of the layer interfaces of our samples is in the atomic layer range or less.…”

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confidence: 99%

Direct observation of frozen moments in the NiFe/FeMn exchange bias system

et al. 2013

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We detect the presence of frozen magnetic moments in an exchange biased NiFe ferromagnet at the NiFe/FeMn ferromagnet/antiferromagnet interface by magnetic circular dichroism in x-ray absorption and resonant reflectivity experiments. Frozen moments are detected by means of the elementspecific hysteresis loops. A weak dichroic absorption with unidirectional anisotropy can be linked to frozen magnetic moments in the ferromagnet. A more pronounced exchange bias for increasing the thickness of the FeMn layer correlates with an increase in orbital moment for interface Ni atoms carrying a frozen moment. These atoms compose about a single monolayer, but only a fraction of the atoms contributes by means of a strongly enhanced orbital moment to the macroscopic exchange bias phenomenon. The microscopic spin-orbit energy associated with these few interface frozen moment atoms appears to be sufficient to account for the macroscopic exchange bias energy. 5 Current address: Outokumpu Stainless AB,

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confidence: 99%

Direct observation of frozen moments in the NiFe/FeMn exchange bias system

et al. 2013

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“…As such, it should be insightful to study the magnetization rotation in exchange biased systems via SRE since their magnetization reversal occurs in only one field direction at a non‐zero field (e.g., opposite to exchange bias field) with a large coercivity so that these magnetization reversal effects can be more easily observed without the need to switch the field polarity. In addition, magnetization reversal in exchange biased systems have been shown to be quite complicated, therefore the possible detection and characterization of magnetization rotation in such systems via spin‐sensitive SRE should be of interest.…”

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Nonresonant and Resonant Spin Rectification in the Exchange Biased NiFe/MnIr Bilayer

Pan

Soh

Phuoc

et al. 2018

Physica Rapid Research Ltrs

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Through a systematic investigation of the magnetization rotation and reversal in an exchange‐biased NiFe/MnIr film electrically detected by spin rectification effect (SRE), we experimentally demonstrate that this SRE DC voltage can be detected in the field‐swept spectra both at resonant and nonresonant conditions. The spectra show clear shifted hysteretic curves driven by exchange bias and a hysteresis loop is formed at applied magnetic field around exchanged bias field by the nonzero SRE DC voltage with sign change with the sweeping direction. More interestingly, we found that the voltage magnitude changes upon switching of magnetization can be greatly enhanced at resonance thereby suggesting an attractive approach to realize a highly sensitive method to measure exchange bias field. This experimental behavior can be interpreted within the framework of the near‐resonant spin rectification effect.

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“…14,15 The induced anisotropy in exchange biased antidots has been studied as a function of lattice geometry [16][17][18][19][20] and the interplay between internal fields. [21][22][23] Patterning allows tailoring of the magnitude and direction of the bias field. 24,25 Some interesting applications are within reach, by making use of multi-state remanent processes occuring in structures with combined positive and negative bias fields.…”

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Anisotropy engineering using exchange bias on antidot templates

Gonçalves

Desautels

et al. 2015

AIP Advances

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We explore an emerging device concept based on exchange bias used in conjunction with an antidot geometry to fine tune ferromagnetic resonances. Planar cavity ferromagnetic resonance is used to study the microwave response of NiO/NiFe bilayers with antidot structuring. A large frequency asymmetry with respect to an applied magnetic field is found across a broad field range whose underlying cause is linked to the distribution of magnetic poles at the antidot surfaces. This distribution is found to be particularly sensitive to the effects of exchange bias, and robust in regards to the quality of the antidot geometry. The template based antidot geometry we study offers advantages for practical device construction, and we show that it is suitable for broadband absorption and filtering applications, allowing tunable anisotropies via interface engineering.

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Magnetization reversal studies of continuous and patterned exchange biased NiFe/FeMn thin films

Cited by 8 publications

References 37 publications

Direct observation of frozen moments in the NiFe/FeMn exchange bias system

Direct observation of frozen moments in the NiFe/FeMn exchange bias system

Nonresonant and Resonant Spin Rectification in the Exchange Biased NiFe/MnIr Bilayer

Anisotropy engineering using exchange bias on antidot templates

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