Study of Co/Pd multilayers as a candidate material for next generation magnetic media

Abstract

Interlayer exchange coupling between [Pd/Co] multilayers and CoFeB/MgO layers with perpendicular magnetic anisotropy Appl. Phys. Lett. 101, 242403 (2012); 10.1063/1.4770300Effect of magnetostatic energy on domain structure and magnetization reversal in (Co/Pd) multilayers Microstructure and magnetic properties of a Co/Pd multilayer on a controlled Pd/Si seed layer for double-layered perpendicular magnetic recording mediaWe report a combinatorial synthesis study on the magnetic properties of sputter-deposited Co/Pd multilayers with high perpendicular anisotropy and high remnant squareness for magnetic media applications such as magnetic logic systems, bit patterned media, magneto-optical recording, and multilevel three-dimensional ͑3D͒ magnetic media. The perpendicular magnetic anisotropy in the multilayers originates from the interfacial anisotropy of the alloylike structure. The deposition conditions and subsequent microstructures of the multilayers are critical factors to determine the magnetic properties of the media. We investigated the dependence of the magnetic properties on the thickness of Co and Pd layers the number of Co/Pd bilayers. For instance, we found that a 0.26-nm-thick layer of Co would produce the highest coercivity value if paired with a 0.55-nm-thick Pd layer. Our results revealed that an Ar + milling could significantly increase the coercivity of the multilayer media. Further, we discovered that we could control the deposition pressure to achieve either granular or continuous media morphologies corresponding to exchange-coupled or decoupled grains, respectively. Finally, we used the combinatorial synthesis to tailor multilayers' properties to engineer a eight-level three-layer 3D media.

MAGNETIC PROPERTIES AND DOMAIN STRUCTURE OF CoFeB/Pd MULTILAYERS WITH PERPENDICULAR MAGNETIC ANISOTROPY

“…At the same time, the roughness and stress could increase as n increased leading to the loss of conformity between the layers. The loss of conformity causes the reduction in the anisotropy energy per interface as n increased [23], resulting in the reduction of the coercivity. The observed coercivity behavior is practically general for magnetic multilayer films [23,24].…”

Reconfigurable and non-volatile vertical magnetic logic gates

“…It has been shown that these properties can be controlled by the deposition parameters, thickness of each layer, and the number of bi-layers that make up each magnetic layer. 28 The following is the selected composition: A number of processes were used to fabricate the media for this experiment: (1) The magnetic media was sputter deposited onto a Si substrate, (2) Hydrogen silsesquioxane (HSQ) was spin coated and then baked onto the top of the media, (3) E-Beam lithography to generate the patterns onto the HSQ, (4) development of the patterns, (5) inductively coupled plasma (ICP) etching of the oxidized Ti layer, (6) Ar-Ion milling of the media to transfer the patterns into the continuous media. A SEM image of the 120 nm diameter patterns can be seen in Figure 2.…”

Влияние морфологии на механизмы перемагничивания многослойных тонких пленок Co/Pd

“…Также в некоторых работах в качестве источника перпендикулярной анизотропии сплава CoPd называется магнитокристаллическая анизотропия, обусловленная формированием тетрагональной гранецентрированной решетки (так называемой фазы типа L1 0 ) [1,6]. Неоднократно показано, что увеличение значений H a и H C , характеризующих свойство ПМА многослойных структур Co/Pt и Co/Pd, может быть достигнуто подбором оптимальных толщин слоев, а также их количества [7,8]. Соблюдение периодичности слоев Со и Pd (Pt) с заданной толщиной, которая, как правило, не превышает 2−5 ¦ , т. е. один или несколько монослоев, позволяет формировать на их основе сверхрешетки [9], квазисплавы из перемешанных компонентов Со и Pd (Pt) [5], которые упорядочиваются в магнитные структуры с ПМА самостоятельно либо под воздействием последующей обработки (отжиг, обучение ионами) [1,10,11].…”