Growth, Structure and magnetism of Cobalt-Platinum Ultrathin Films and Sandwiches

1993 ◽  
Vol 313 ◽  
Author(s):  
J.P. Deville ◽  
A. Barbier ◽  
C. Boeglin ◽  
B. Carriere
Keyword(s):  
Magnetic Properties ◽  
Ultrathin Films ◽  
Auger Spectroscopy ◽  
Optical Recording ◽  
Alloy Formation ◽  
Growth Structure ◽  
Growth Modes ◽  
Ultrathin Layers ◽  
Low Energy Electron ◽  
The Relationship

ABSTRACTCobalt-platinum alloys and multilayers are now well known for their potentialities in Magneto-optical recording Media. The growth of ultrathin layers and sandwiches is thought to be useful to find the relationship between the structural and magnetic properties at an atomic level. Low Energy Electron Diffraction (LEED) and Auger spectroscopy (AES) are used here to study the crystallography and the growth modes of Pt on Co (0001) surfaces. Co/Pt/Co sandwiches are also built and investigated by the same Methods. At room temperature we show the evidence of a good epitaxy of platinum on the Co (0001) surface leading to the possibility of obtaining ordered Co/Pt/Co sandwiches. Annealings at moderate temperatures lead to an epitaxial alloy formation. Auger results show that alloying indeed induces a magnetic moment on platinum atoms. This could explain the magnetic properties already observed in CO/Pt (111) Multilayers.

Growth, structure and magnetic properties of Co ultrathin films on Cu(111) by pulsed laser deposition

2000 ◽  
Vol 12 (6) ◽  
pp. 783-794 ◽  
Author(s):  
M Zheng ◽  
J Shen ◽  
J Barthel ◽  
P Ohresser ◽  
Ch V Mohan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Pulsed Laser Deposition ◽  
Ultrathin Films ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Growth Structure

Microstructural dependence of magnetic properties of Pt/Co multilayers for magneto-optical recording devices

1991 ◽  
Vol 49 ◽  
pp. 778-779
Author(s):  
Z.G. Li ◽  
P.F. Carcia
Keyword(s):  
Magnetic Properties ◽  
High Resolution Electron Microscopy ◽  
Optical Recording ◽  
Total Thickness ◽  
Cross Sectional ◽  
Sputtered Films ◽  
Resolution Electron ◽  
Relationship Of ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

Pt/Co ultrathin multilayer films are a new candidate for magneto-optical (MO) recording devices. We have previously shown that their magnetic properties are improved by sputtering them with either Kr or Xe instead of Ar. Specifically, Arsputtered films have too small coercivity for recording. In this study we demonstrate that high resolution electron microscopy (HREM) is a powerful technique to study the relationship of the multilayer microstructure and magnetic properties. We used a Philips CM30 and a JEM 2000FX microscope to study multilayers with a typical total thickness in the 10 nm range, consisting of only 1-2 atomic layers of Co and 4-6 atomic layers of Pt.Figure 1 compares the cross sectional microstructure of nearly identical Pt/Co multilayers (~10x[4Å Co+13Å Pt]) sputtered in (A) 7 mTorr of Ar, (B) 7 mTorr of Kr, and (C) 5 mTorr of Xe. The layers sputtered in Ar are extremely flat and continuous. Sputtering with a larger mass gas (Kr or Xe) progressively increased the layer roughness, and the lateral continuity of layers was more frequently interrupted by grain boundaries, which were very distinct in Kr- and Xe-sputtered films compared to Ar-sputtered films.

Magnetostructural relationships in [Ni(dmit)2] − radical anions

2021 ◽  
Author(s):  
Jhon Enrique Zapata Rivera ◽  
Carmen J. Calzado
Keyword(s):  
Magnetic Properties ◽  
Radical Anions ◽  
The Relationship

This work explores the relationship between the magnetic properties of salts based on the [Ni(dmit)2]− radicals and the different arrangement that these radicals can adopt in the crystals, induced by...

Influence of the interface on the magnetic properties of ferromagnetic ultrathin films with various adjacent copper thicknesses

2014 ◽  
Vol 115 (17) ◽  
pp. 17C108 ◽  
Author(s):  
Dong Zhang ◽  
Sheng Jiang ◽  
Chen Luo ◽  
Yukun Wang ◽  
Wenbin Rui ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ultrathin Films

Variations in magnetic properties of Mexican serpentinites and related micro-textures 

2021 ◽  
Author(s):  
Sandra B. Ramírez-García ◽  
Luis M. Alva-Valdivia
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Ultramafic Rocks ◽  
Magnetic Carrier ◽  
Temperature Dependent ◽  
Geochemical Studies ◽  
The Relationship ◽  
Magnetite Formation

<p>Magnetite formation of serpentinized ultramafic rocks leads to variations in the magnetic properties of serpentinites; however, magnetite precipitation is still on debate.</p><p>In this work, we analyzed 60 cores of ultramafic rocks with a variety of serpentinization degrees. These rocks belong to the ultramafic-mafic San Juan de Otates complex in Guanajuato, Mexico. Geochemical studies have been previously conducted, enabling us to compare changes in the magnetic properties against the chemical variations generated by the serpentinization process. By studying the density and magnetic properties such as anisotropy of magnetic susceptibility, hysteresis curves as well as magnetic and temperature-dependent susceptibility and, we were able to identify the relationship between magnetic content and serpentinization degree, the predominant magnetic carrier, and to what extent the magnetite grain size depends on the serpentinization.  Variations in these parameters allowed us to better constrain the temperature at which serpentinization occurred, the generation of other Fe-rich phases such as Fe-brucite and/or Fe-rich serpentine as well as distinctive rock textures formed at different serpentinization degrees.</p>

Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5

2016 ◽  
Vol 420 ◽  
pp. 309-316 ◽  
Author(s):  
S. Sofronova ◽  
E. Moshkina ◽  
I. Nazarenko ◽  
Yu. Seryotkin ◽  
S.A. Nepijko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Crystal Growth ◽  
Exchange Interaction ◽  
Growth Structure

Crystal growth, structure, and magnetic properties of H0.23Li1.68Mo1.05O3

1991 ◽  
Vol 91 (1) ◽  
pp. 126-130 ◽  
Author(s):  
A.C.W.P. James ◽  
D.W. Murphy ◽  
T. Siegrist ◽  
J.V. Waszczak ◽  
P. Marsh ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Crystal Growth ◽  
Growth Structure
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