Criteria for saturated magnetization loop

Harres, A.; Mikhov, M.; Skumryev, V.; Andrade, Ankilma do Nascimento; Schmidt, João Edgar; Geshev, J.

doi:10.1016/j.jmmm.2015.11.046

Cited by 92 publications

(53 citation statements)

References 41 publications

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“…Importantly, the effect is not supposed to be attributed to erroneously measuring minor loops due to insufficient intensity of saturation field, a problem which is known from several systems in experiment and theory. [18][19][20] Here, the risk of not reaching a saturated state was eliminated by measuring in fields up to 0.5 T which is nearly ten times higher than average coercive fields detected for this sample.…”

Section: Resultsmentioning

confidence: 84%

Angle and rotational direction dependent horizontal loop shift in epitaxial Co/CoO bilayers on MgO(100)

Ehrmann

Błachowicz

2017

AIP Advances

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Co/CoO belongs to the typical exchange bias systems which have been investigated for decades. Surprisingly, Co/CoO thin film systems epitaxially grown on MgO(100) substrates show a strong influence of the relative orientation of the average uncompensated antiferromagnetic magnetization with respect to the cooling field direction, giving rise to unexpected asymmetric angular dependencies of the horizontal loop shift as well as the sign of the transverse magnetization peaks in magneto-optical Kerr effect (MOKE) experiments. In this paper, we provide a broad overview of the influence of cooling field orientation and sample orientation on magnetization reversal processes in this system.

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Section: Resultsmentioning

confidence: 84%

Angle and rotational direction dependent horizontal loop shift in epitaxial Co/CoO bilayers on MgO(100)

Ehrmann

Błachowicz

2017

AIP Advances

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“…The asymmetric behavior sometimes is caused by the minor loop due to the unsaturated magnetization measurement. 16,17 In order to exclude this probability, the second derivatives of the respective descending and ascending branches of the field cooled MH for negative fields are calculated and shown in Fig. 3(b).…”

Section: -4mentioning

confidence: 99%

“…The second derivatives of the two branches are overlap when the field is higher than 40 kOe, indicating a saturated loop here. 16 Therefore, this asymmetric behavior is caused by the existence of EB effect in SCO2.29. Usually, the critical parameters of EB effect are exchange bias field H EB and coercivity field H C , which can be defined as H EB = | H 1 + H 2 |/2, and H C = | H 1 H 2 |/2, respectively, where H 1 and H 2 are left and right coercive fields.…”

Section: -4mentioning

confidence: 99%

Temperature- and magnetic field-dependence of exchange bias in SrCoO2.29 ceramics

2017

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A cation’s oxidation state in a transition metal oxide may significantly change its physical and chemical properties. In this work, magnetic properties of both cubic SrCoO2.29 and hexagonal SrCoO2.50 ceramics, annealed following a selected yet simple process, have been studied. The SrCoO2.50 ceramics annealed in air displays an unusual paramagnetic property, and the SrCoO2.29 quenched into water shows a short-range ferromagnetic coupling in the antiferromagnetic background. Exchange coupling at the ferromagnetic/antiferromagnetic interfaces brings out an obvious exchange bias effect in the SrCoO2.29 sample. Due to its complicated magnetic states, the exchange bias effect presents strong temperature and cooling field dependences.

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“…Even with the strong evidence of SG coupling, we cannot discount the possibility that there is also direct coupling between NiFe 2 O 4 and NiO in this sample, where the Néel temperature (T N ) of NiO has been supressed below 300 K due to finite size effects. The extent to which T N is reduced has been debated in the literature and the large variance in degree appears to stem from measurement technique (i.e., electron spin resonance [46], low field ZFC magnetic susceptibility [47], neutron diffraction [48] and muon spin relaxation/rotation [49]), identity of the antiferromagnet, and particle size and shape [49].…”

Section: Magnetic Measurementsmentioning

confidence: 99%

“…As such, the origin of the EB effect in this case is most likely due to coupling between NiFe 2 O 4 (FiM) and NiO (AFM). EB is unlikely to appear in a bulk system where NiO is the AFM without FC through T N of NiO (525 K); however, when the NiO grains are confined to the nanoscale, a reduction in T N may be observed [48,50].…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Exchange bias and spin glass behavior in biphasic NiFe2O4/NiO thin films

Pebley

Fuks

Pollock

et al. 2016

Journal of Magnetism and Magnetic Materials

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a b s t r a c tMagnetic exchange bias and coercivity of nanogranular NiFe 2 O 4 /NiO thin films, prepared using flowstabilized microplasmas and post-deposition annealing, have been investigated as a function of ferrimagnet/antiferromagnet phase fraction, grain size, and temperature. Exchange bias (EB) and vertical shifts in hysteresis loops observed in the as-deposited and low-T annealed ( r 600°C) films were attributed to exchange coupling between nanocrystalline NiFe 2 O 4 ( $ 8-10 nm) and a structurally-disordered spin glass (SG)-like phase. At higher annealing temperature (850°C), the observed EB was found to arise from exchange coupling between NiFe 2 O 4 and NiO, rather than a SG phase, most likely due to reduction of structurally-disordered interfaces and a substantial increase in NiFe 2 O 4 grain size ( $ 26 nm).

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Criteria for saturated magnetization loop

Cited by 92 publications

References 41 publications

Angle and rotational direction dependent horizontal loop shift in epitaxial Co/CoO bilayers on MgO(100)

Angle and rotational direction dependent horizontal loop shift in epitaxial Co/CoO bilayers on MgO(100)

Temperature- and magnetic field-dependence of exchange bias in SrCoO2.29 ceramics

Exchange bias and spin glass behavior in biphasic NiFe2O4/NiO thin films

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