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Exchange coupling at cobalt/nickel o...

The University of Nebraska - Lincoln., Physics & Astronomy.

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Exchange coupling at cobalt/nickel oxide interfaces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Exchange coupling at cobalt/nickel oxide interfaces./
作者:	Baruth, Andrew Gerald.
面頁冊數:	239 p.
附註:	Adviser: Shireen Adenwalla.
Contained By:	Dissertation Abstracts International70-03B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3350440
ISBN:	9781109084337

Exchange coupling at cobalt/nickel oxide interfaces.
Baruth, Andrew Gerald.

Exchange coupling at cobalt/nickel oxide interfaces. - 239 p.

Adviser: Shireen Adenwalla.

Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2009.

Spin arrangement at interfaces in layered magnetic materials is of vital importance to the emerging field of spintronics. Knowledge of how and why the interfacial spins behave in a certain way will aid in the development of future magnetic-based memories.

ISBN: 9781109084337Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Exchange coupling at cobalt/nickel oxide interfaces.
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245 1 0 $a Exchange coupling at cobalt/nickel oxide interfaces.
300 $a 239 p.
500 $a Adviser: Shireen Adenwalla.
500 $a Source: Dissertation Abstracts International, Volume: 70-03, Section: B, page: 1728.
502 $a Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2009.
520 $a Spin arrangement at interfaces in layered magnetic materials is of vital importance to the emerging field of spintronics. Knowledge of how and why the interfacial spins behave in a certain way will aid in the development of future magnetic-based memories.
520 $a Much exploration has taken place in the interlayer exchange coupling (IEC) of ferromagnetic heterostructures with in-plane anisotropy. Only recently has it become apparent that to achieve the goals of increased areal density in magnetic memory a push for exploring magnetic materials with perpendicular magnetic anisotropy (PMA) must occur. An interesting and promising candidate for such a magnetic system is [Co/Pt]/NiO/[Co/Pt], where two [Co/Pt] multilayers with PMA are separated by a thin, insulating, antiferromagnetic NiO layer and display oscillatory coupling with NiO thickness. This magnetic heterostructure displays an entirely new IEC where the Ni spins within the NiO layer cant in concert with the adjacent [Co/Pt] layers, causing the periodicity of the oscillatory coupling to coincide with the NiO antiferromagnetic ordering parameter. The strength and sign of this coupling, either positive (favoring parallel alignment) or negative (favoring anti-parallel alignment), can be tuned with slight changes in the NiO layer thickness. The origin of the oscillatory IEC was investigated using advanced microscopy and spectroscopy techniques.
520 $a For antiferromagnetically coupled [Co/Pt] layers, the competition between magnetostatic coupling and IEC gives rise to a region of overlapping domains (resulting in a ferromagnetically coupled stripe). Discovered with high resolution magnetic force microscopy and quantitatively modeled with micromagnetic simulation, the width of this overlap region scales inversely with the IEC.
520 $a Heterostructures of Co/NiO/[Co/Pt], where the Co ([Co/Pt]) has in-plane (out-of-plane) anisotropy, allow for isothermal tuning of the hysteresis loop shift along the applied field axis at room temperature, as well as display a greatly enhanced blocking temperature (increase of more than 175K). The presence of the [Co/Pt] multilayer with PMA is responsible for the enhancement. In addition, these structures display temperature dependent exchange bias training effects, which have been successfully modeled using a phenomenological thermodynamic approach.
590 $a School code: 0138.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
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710 2 $a The University of Nebraska - Lincoln. $b Physics & Astronomy. $3 1064692
773 0 $t Dissertation Abstracts International $g 70-03B.
790 $a 0138
790 1 0 $a Adenwalla, Shireen, $e advisor
790 1 0 $a Binek, Christian $e committee member
790 1 0 $a Keavney, David $e committee member
790 1 0 $a Shield, Jeffrey $e committee member
790 1 0 $a Tsymbal, Evgeny $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3350440