Positive and negative exchange bias in CoNi/Gd/CoNi trilayers and CoNi/Gd bilayers

Altuncevahir, B.; Köymen, A. R.

doi:10.1016/s0304-8853(02)01493-2

Cited by 28 publications

(11 citation statements)

References 39 publications

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“…[4][5][6][7][8][9][10][11][12][13] Their fundamental property is the antiferromagnetic coupling between the TM and the heavy RE such as Gd or Tb. Unlike the typical antiferromagnetism, here the magnetizations of the two components are not equal; the system has a total magnetic moment that will be zero at a certain temperature, T comp , the compensation temperature.…”

Section: Introductionmentioning

confidence: 99%

Field controlled magnetic thermal hysteresis in Co∕Tb multilayers

Hossu

Köymen

2006

Journal of Applied Physics

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Experimental results proving that Co∕Tb multilayers show thermal hysteresis in the total magnetic moment are presented. [Co(30Å)∕Tb(45Å)]8 was synthesized using dc magnetron sputtering. Due to antiferromagnetic coupling between the Co and Tb layers this system behaves like an artificial ferrimagnet. The measurement of magnetic moment (M) as a function of temperature (T) shows that magnetic phase transition occurs at different temperatures during heating (superheating) and cooling (supercooling) cycles resulting in a characteristic bow-tie shaped thermal hysteresis curve for M(T). The width of the thermal hysteresis was measured to be around 90 K in an external magnetic field of 2000 Oe. Increasing the field to 4000 Oe reduces the thermal hysteresis width to about 40 K and above 6000 Oe the width disappears. Co∕Tb multilayers with thicker layers such as [Co(40Å)∕Tb(60Å)]8 show the same trend. However, the width of the thermal hysteresis is generally smaller at a given magnetic field.

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Section: Introductionmentioning

confidence: 99%

Field controlled magnetic thermal hysteresis in Co∕Tb multilayers

Hossu

Köymen

2006

Journal of Applied Physics

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“…11 and 12͒ and CoNi/ Gd. 13 The Fe/ Gd system has a number of known magnetic states. 1,2 There is a low-temperature Gd-aligned state where the Gd magnetization is aligned with the external field ͑and the Fe is opposite͒ and there is a high-temperature Fe-aligned state where the Fe magnetization is aligned with the external field ͑and Gd is opposite͒.…”

mentioning

confidence: 99%

Tunable magnetic thermal hysteresis in transition metal (Fe, Co, CoNi)/rare earth (Gd) multilayers

et al. 2005

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Magnetic thermal hysteresis in Co/ Gd, CoNi/ Gd, and Fe/ Gd multilayers is investigated by measurements of the total magnetic moment. A measurement of the magnetization as a function of temperature for the antiferromagnetically coupled multilayers displays a characteristic bow-tie shape indicating magnetic superheating and supercooling. The width of the thermal hysteresis can be tuned by an external magnetic field, with values of 150 K at fields near 100 Oe and values of 20 K near 400 Oe. The results are in good agreement with our theoretical calculations.

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“…Positive exchange bias, a shift of the hysteresis loop toward a positive magnetic field when the system is cooled in positive fields, is an unusual situation. It was first observed in Fe/ FeF 2 and Fe/ MnF 2 bilayers, 5,9 more recently in other layered systems, 10,11 and is normally associated to antiferromagnetic exchange coupling at the interface between the magnetic layers. 5 Nowadays, there is huge interest in diluted magnetic semiconductor and also a renewed interest in bulk magnetic semiconductors, among them GaN and the europium chalcogenides.…”

Section: Introductionmentioning

confidence: 93%

Exchange bias in Fe/EuTe(111) bilayers

Macedo

Martins

Pires

et al. 2007

Journal of Applied Physics

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We report on the investigation of the exchange bias effect in Fe layers on EuTe͑111͒, an antiferromagnetic semiconductor. For this ferromagnet ͑FM͒/semiconducting antiferromagnet ͑AFM͒ exchange bias system, we have found positive and negative exchange bias effect ͑EB͒. Fresh samples exhibit positive EB, independently of the applied cooling field, indicating antiferromagnetic coupling between the FM and the AFM layers at the Fe/EuTe͑111͒ interface. The change in EB with time, from positive EB for fresh samples to negative EB after short time,is attributed to aging effects at the Fe/EuTe interface.

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Positive and negative exchange bias in CoNi/Gd/CoNi trilayers and CoNi/Gd bilayers

Cited by 28 publications

References 39 publications

Field controlled magnetic thermal hysteresis in Co∕Tb multilayers

Field controlled magnetic thermal hysteresis in Co∕Tb multilayers

Tunable magnetic thermal hysteresis in transition metal (Fe, Co, CoNi)/rare earth (Gd) multilayers

Exchange bias in Fe/EuTe(111) bilayers

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