1994
DOI: 10.1063/1.358488
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Distribution of blocking temperature in bilayered Ni81Fe19/NiO films

Abstract: Exchange paths were investigated for unidirectional exchange coupled 40 mn Nis,Fe,dSO mn NiO films by performing several field cooling experiments. Our experimental data were very consistent with the assumed existence of a variety of exchange paths. Each exchange path seemed to produce its own local unidirectional anisotropy and different local blocking temperature. The measureable exchange coupling could be described as consisting of the sum of the respective exchange paths, each with its own local blocking t… Show more

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Cited by 131 publications
(91 citation statements)
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“…Stiles and Me Michael [4] have recently proposed a model for polycrystalline samples in which AF grains are divided into two groups according to the e = iJo --K ratio where Jc is the average direct coupling between the AF and the F. Grains with low E contribute to the exchange bias whereas those with high E can induce coercive field. This theory is coherent with experimental studies made by S. Soeya et al in NiO/NiFe [5] bilayers who report that many "local domain paths" between TN(NiO) and room temperature are involved in the coupling. These paths can be "activated" reducing temperature.…”
Section: Introductionsupporting
confidence: 90%
See 1 more Smart Citation
“…Stiles and Me Michael [4] have recently proposed a model for polycrystalline samples in which AF grains are divided into two groups according to the e = iJo --K ratio where Jc is the average direct coupling between the AF and the F. Grains with low E contribute to the exchange bias whereas those with high E can induce coercive field. This theory is coherent with experimental studies made by S. Soeya et al in NiO/NiFe [5] bilayers who report that many "local domain paths" between TN(NiO) and room temperature are involved in the coupling. These paths can be "activated" reducing temperature.…”
Section: Introductionsupporting
confidence: 90%
“…Such distribution has been previously observed by Soeya at al. [5] on polycristalline NiO/NiFe samples. They conclude that higher blocking temperature density is very close to the global blocking temperature near 215'C.…”
Section: Ti84mentioning
confidence: 99%
“…I.C.3), whereas the Néel temperature is intrinsic to the antiferromagnet (Berkowitz and Takano, 1999;Nogués and Schuller, 1999). The blocking temperature can easily be determined experimentally, for example, by measuring the disappearance of the hysteresis loop shift as the external temperature rises, or by using specific field-cooling protocols (Soeya et al, 1994;Baltz, Rodmacq et al, 2010). In contrast, it is much more challenging to determine the Néel temperature for a thin film of isolated antiferromagnetic material.…”
Section: B Magnetic Phase Transition and Finite-size Scalingmentioning
confidence: 99%
“…Sometimes the technique, developed by Soeya et al [26], is used to determine T B . With this method a sample is first field cooled to the temperature T m , then warmed up at zero field to a certain temperature, at which the magnetic field of the opposite sign is applied, and the sample is cooled back to T m at this field.…”
Section: Figmentioning
confidence: 99%