The relationship between microstructure and magnetic properties in L1/sub 0/ ordered Fe-Pd ferromagnets

1994 ◽  
Vol 30 (2) ◽  
pp. 589-591 ◽  
Author(s):  
B. Zhang ◽  
T. Klemmer ◽  
D. Hoydick ◽  
W.A. Soffa
Keyword(s):  
Magnetic Properties ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

Effects of Sputtering Conditions on Texture, Microstructure and Magnetic Properties of the CoCrPt/NiAl Thin Films

1998 ◽  
Vol 517 ◽  
Author(s):  
Y.-N. Hsu ◽  
D. E. Laughlin ◽  
D. N. Lambeth
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Magnetic Properties ◽  
Optimum Pressure ◽  
Grain Sizes ◽  
Maximum Value ◽  
Sputtering Power ◽  
Sputtering Pressure ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

AbstractThe effects of sputtering argon pressures and sputtering power on the microstructure, texture and magnetic properties of NiAI underlayers on CoCrPt films were investigated. In this paper, the relationship between the sputtering conditions, microstructure, crystallographic texture and magnetic properties of these thin films will be discussed. By controlling the sputtering pressure and sputtering power, the texture and microstructure of NiAI underlayers were found to vary. This in turn was found to influence the magnetic properties of CoCrPt thin films. It was found that 10 mtorr is the optimum pressure to deposit the NiAl thin films to obtain the best magnetic properties for our system. At this argon pressure, the coercivity reached a maximum value because of the strongest CoCrPt (1010) texture and smallest grain size. At lower argon pressures (< 10 mtorr), NiAI tended to have a (110) texture reducing the CoCrPt (1010) texture, which in turn reduced the CoCrPt coercivity and S*. Also, high NiAl deposition pressures (>30 mtorr) yielded larger grains and a weaker CoCrPt (1010) texture, thereby decreasing the coercivity of the CoCrPt films. Increasing the sputtering power has been found to increase the CoCrPt coercivity and S* value. However, the grain sizes of the CoCrPt/NiAl thin films deposited at higher sputtering power were larger than those obtained at lower sputtering power.

Relationship between Microstructure and Magnetic Properties of Nano-Scale Particles Formed in Cu-Ni-(FeCo) Alloys

2018 ◽  
Vol 941 ◽  
pp. 1324-1329 ◽  
Author(s):  
Shintaro Matai ◽  
Hibiki Sakakura ◽  
Mahoto Takeda
Keyword(s):  
Magnetic Properties ◽  
Quantum Interference ◽  
Magnetic Particles ◽  
Superconducting Quantum Interference Device ◽  
Recording Technology ◽  
Treatment Conditions ◽  
Transmission Electron ◽  
Feco Alloys ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

Numerous studies have been conducted to develop next-generation recording technology in spintronics. Because ultrafine magneitc particles are vital components of the technology, the interplay between the microsturcture and magnetic properties has attracted attention extensively in recent years. We focused on the relationship between the microstructure and magnetic properties of Cu-Ni-X (X=Fe, Co, FeCo) alloys comprising nanogranular magnetic particles. In this work, we prepared Cu-20 at% Ni-5 at% (FeCo), Cu-20 at% Ni-5 at% Fe, Cu-20 at% Ni-5 at% Co and examined the changes of microstructure and magnetic properties associated with heat treatments and composition. To examaine microstructural evolution of the alloy specimens, we conducted transmission electron microscope observations (TEM) with the as-quenched specimens and those aged at at 773-1073 K. We also carried out magneto-thermo gravimetry (MTG) measurements, superconducting quantum interference device (SQUID) measurements, magnetoresistance (MR) measurements and first-principles calculations based on the Koster-Korringa-Rostker (KKR) method with the Coherent Potential Approximation (CPA), to investigate the magnetic properties. The present work confirmed that the microstructure significantly changed, depending on the composition and heat treatment conditions. The present work also revealed that the magnetic properties closely correlated with the microstructure of samples.

The relationship of microstructure and magnetic properties in cold-rolled 6.5% Si-Fe alloy

1996 ◽  
Vol 32 (5) ◽  
pp. 4818-4820 ◽  
Author(s):  
X.F. Bi ◽  
Y. Tanaka ◽  
K. Sato ◽  
K.I. Arai ◽  
K. Ishiyama ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cold Rolled ◽  
Relationship Of ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

Precipitation Behavior and Magnetic Properties of Nanoscale Particles in a Cu–10 at% Ni–5 at% Co Alloy

2014 ◽  
Vol 1077 ◽  
pp. 23-29 ◽  
Author(s):  
Dong Hae Lee ◽  
Mahoto Takeda ◽  
Masaki Takeguchi ◽  
Dong Sik Bae
Keyword(s):  
Magnetic Properties ◽  
Annealing Time ◽  
Curie Point ◽  
Copper Matrix ◽  
Precipitation Behavior ◽  
Transmission Electron ◽  
Initial Stage ◽  
Short Annealing ◽  
The Relationship ◽  
Microstructure And Magnetic Properties

We investigated the relationship between the microstructure and magnetic properties of a Cu–10 at% Ni–5 at% Co alloy by using a transmission electron microscope (TEM), a SQUID magnetometer and a magnetic thermo–balance. TEM observations were performed to examine the microstructures of the Cu–Ni–Co specimens annealed at four temperatures between 873 K and 1073 K below and above the Curie point (983 K).Particles with cubic shapes were linearly arranged along the <100> direction of the copper matrix in specimens prepared by isothermal annealing at temperatures below the Curie point, while octahedral precipitates were sparsely formed by annealing above the Curie point. The TEM observations confirmed that the microstructural evolution in the Cu–Ni–Co specimens isothermally annealed at 1023 K. Although coherent cubic particles appeared at the initial stage of annealing, incoherent precipitates were finally formed with increased annealing time at 1023 K. The present SQUID measurements indicated that the curve of coercive force vs. annealing time had a peak at a short annealing period.

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.

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