Interface roughness effects on coercivity and exchange bias

Dantas, Ana L.; Rebouças, G. O. G.; Silva, André S. W. T.; Carriço, A. S.

doi:10.1063/1.1847931

Cited by 23 publications

(15 citation statements)

References 14 publications

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“…Two interesting examples of current interest are FM/AFM bilayers with interface energy compensation due to interface roughness 30-32 and vicinal bilayers. 33 Field-tunable thermal hysteresis is likely to occur in these exchange-coupled FM/ AFM bilayers, [30][31][32][33] provided that the interface magnetic structure is compensated at a length scale smaller than the exchange length of the ferromagnetic material.…”

Section: Resultsmentioning

confidence: 99%

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

et al. 2009

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We report a theoretical investigation of thermal hysteresis of fourfold anisotropy ferromagnetic ͑FM͒ film exchange coupled to a compensated antiferromagnetic substrate. Thermal hysteresis occurs if the temperature interval includes the reorientation transition temperature, below which the frustration of the interface exchange coupling leads to a 90°rotation of the magnetization of the ferromagnetic layer. The temperature width of the thermal hysteresis is tunable by external magnetic fields of modest magnitude, with values of 43 K for an external field of 110 Oe and of 14 K for a field of 210 Oe, for a Fe͑12 nm͒ / MnF 2 ͑110͒ bilayer. For a Fe͑3 nm͒ / FeF 2 ͑110͒ bilayer the width of the thermal hysteresis is 23 K at 110 Oe and 13 K at 300 Oe. We discuss how the thickness of the iron film affects the field tuning of the thermal hysteresis width, and also how the thermal loops may be used to identify the nature of the interface exchange energy.

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Section: Resultsmentioning

confidence: 99%

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

et al. 2009

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“…We use a self-consistent local field algorithm, [19][20][21] and, at each temperature, the equilibrium state ͓͑m i ͒ , i =1, 2, ... ,N͔ is found by seeking a magnetic configuration in which the torque is zero in all the cells ͑m ជ i ϫ H ជ eff i = 0 for i =1,2, ... ,N͒, where the effective field is H ជ…”

Section: Modelmentioning

confidence: 99%

Thermal hysteresis of interface biased ferromagnetic dots

Dantas

Silva

Rebouças

et al. 2007

Journal of Applied Physics

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We present a theoretical investigation of the thermal hysteresis of iron dots exchange-coupled to an antiferromagnetic substrate. We consider a temperature interval bounded by the Néel temperature of the substrate, and we calculate the heating and cooling curves in the presence of an external field oriented opposite to the interface exchange field. The thermal hysteresis is due to the temperature variation of the interface field and the influence of the geometrical shapes and sizes of the dots on the magnetic states and switching mechanisms. We show that Fe dots on an uncompensated NiO substrate exhibit large thermal hysteresis at room temperature, and external fields of a few kOe. The width of the hysteresis loops depends on the dimensions of the ferromagnetic dot, and can be significant for dots elongated in the direction of the interface field.

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“…Furthermore, by exchange coupling a ferromagnetic nanoelement to a large uniaxial anisotropy antiferromagnetic substrate, one favors the formation interface areas with spins locked to the interface field direction. [9][10][11] Thus, even for small height nanoelements, interface biasing may lead to a layer dependent magnetic profile.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the vortex core in confined magnetic nanostructures

Moura

Oliveira

Carriço

et al. 2012

Journal of Applied Physics

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We present a study of vortex formation in interface biased nano-sized disk and square nanoelements of Fe and Py TM. For small lateral dimensions, the circular nanoelements have smaller vortex core diameter than square nanoelements with equal top surface area. For surface area ranging from 1900 nm 2 to 6700 nm 2 , the vortex core diameter of 30 nm thick Fe (Py TM) nanoelements varies from 32 nm (36 nm) to 36 nm (48 nm). Interface effects are stronger for Py TM nanoelements. V

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Interface roughness effects on coercivity and exchange bias

Cited by 23 publications

References 14 publications

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

Thermal hysteresis of interface biased ferromagnetic dots

Tailoring the vortex core in confined magnetic nanostructures

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