Oscillatory magnetic exchange coupling through thin copper layers

Very large magnetoresistance in electrodeposited single-crystal Bi thin films (invited)

“…Because of its semimetallic nature, there are both holes and electrons in Bi, and the mobility of the electrons is much larger than that of the holes. With a low carrier concentration of nϭ3ϫ10 23 /m 3 , the values of n and the Hall constant R H ϭ1/nec for Bi are, respectively, five orders of magnitude smaller and larger than those of Cu. 12 The effective carrier mass m* and the con- The earlier simple analyses show that very large MR effects can be observed in Bi samples with a very long mean free path l. This has been realized in bulk Bi single crystals with l in excess of 100 m that show MR as much as 10 6 times at low temperatures.…”

“…Even though the magnitude is relatively small ͑2%͒, the AMR effect in permalloy has already been extensively used in MR read heads and sensors for low magnetic fields. The discovery in 1988 of giant MR ͑GMR͒ in antiferromagnetically coupled magnetic multilayers ͑e.g., Co/Cu͒, 2,3 and subsequently in other geometries such as granular systems ͑e.g., Co particles in a Cu matrix͒, 4,5 has attracted worldwide attention. The term GMR now refers to MR effects due to spin-dependent scattering, which can be ''giant'' ͑as much as 150% in ideal cases͒ 6 or small ͑of order 10% in most cases͒.…”

The Behaviour of Surfactants during the Growth of Co/Cu Multilayers

“…The evaporation rates and layer thicknesses were monitored in situ by the quartz balance. The thickness of Cu layer (2 nm) corresponds to the second antiferromagnetic maximum of the exchange coupling between Co layer through Cu spacer [3]. The thickness of Co layer (1 nm) ensures the continuity of the layers and simplifies magnetic measurements.…”

“…The cobalt/copper multilayers belong to the systems which have been extensively investigated, mostly due to the discovery of the interlayer exchange coupling [1][2][3], and giant magnetoresistance effect (GMR) [4]. The GMR is affected by the oscillatory exchange coupling which strongly depends on the structure of the Co/Cu interfaces [5].…”

Магнитооптические, оптические и магнитотранспортные свойства сверхрешеток Co/Cu с ультратонкими слоями кобальта

“…Известно, что сверхрешетки Co/Cu со сплошными ферромагнитными (FM) слоями Co обладают гигант-ским магнитосопротивлением (ГМС), величина которо-го при комнатной температуре может достигать значе-ний 50−80% [1,2]. Описание эффекта ГМС в нанострук-турах Co/Cu в рамках первопринципных вычислений для CIP (ток в плоскости пленки) и CPP (ток перпендикуля-рен плоскости пленки) -геометрий эксперимента про-ведено, в частности, в работах [3,4] с учетом спиновой поляризации энергетических зон и (s, p-d)-гибридизации электронных состояний в f cc Co. Числовые оценки коэффициента спиновой асимметрии рассеяния электро-нов проводимости на интерфейсе Co/Cu получены из измерений ГМС в геометрии CPP [5,6], из измерений ИК-магниторефрактивного эффекта [7], а также из пер-вопринципных расчетов [8].…”