Magnetisation reversal mechanism in CoCr media for perpendicular magnetic recording

Haan, S. de; Lodder, J.C.

doi:10.1016/s0304-8853(96)00733-0

Cited by 7 publications

(5 citation statements)

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“…They found that the magnetic unit for Co-Cr films with a high CS was smaller than that of a grain. From the results of the computer simulations we have seen that an initial layer (or in-plane) component lowers the coercivity and the saturation field and facilitates the reversal of smaller units [50]. If the real Co-Cr sample has a cp-structure the inplane components (magnetic and non-magnetic) are also distributed inside the columns making the reversal of parts of the colunm more probable [8].…”

Section: Discussionmentioning

confidence: 99%

“…As can be seen from fig.4b relative large areas of the Co-Cr cross have been removed by etching which reduces the perpendicular component of the demagnetising factor (NJ inside the Hall cross and therefore the recorded hysteresis loops will become less sheared. This problem has been discussed in [50]. To check the validity of this method samples with various dimensions have been analyses and also noise analysis of the measuring method have been carried out [50].…”

Section: Anomalous Hall Measurements On Sub-micron Samplesmentioning

confidence: 99%

“…This problem has been discussed in [50]. To check the validity of this method samples with various dimensions have been analyses and also noise analysis of the measuring method have been carried out [50]. The total ... reveals that there is also an increase in the signal in this part of the curve.…”

Section: Anomalous Hall Measurements On Sub-micron Samplesmentioning

confidence: 99%

“…This means that this effect is not caused by the normal Hall effect but by a very small increase in the ARE voltage for these very small field steps The noise in the curves was measured by determining 4x the rms noise at saturation which contains about 95% of all data points and is about % of the total signal (100% = 2xM.) [50]. As the number of columns in the centre of the Hall cross in this sample is about 25, and most of the ARE-signal is derived from the Hall cross weexpect that the number of jumps would be …”

Section: Anomalous Hall Measurements On Sub-micron Samplesmentioning

confidence: 99%

“…Each curve contains only the steps with a certain stepsize and each of these Stepsize distinguished Partial Anomalous Hall Effect loops (SPAHE-Ioops) can be considered as the hysteresis loop of all the magnetic 'volumes' within a certain range [50). Each range of jumpsizes is denoted by a Class, and those classes are defined in table 3, where AM is the change in magnetic moment of each step.…”

Section: Stepsize Distinguished Partial Ahe Loops (Spahe-ioops)mentioning

confidence: 99%

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Magnetic microstructures in Co-Cr sputtered thin films for perpendicular recording

Lodder

Haan

1997

J. Magn. Soc. Jpn.

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Abstract-The relation between deposition parameters, microstructural and magnetic properties are influencing the reversal mechanism of sputtered Co-Cr thin films having perpendicular anisotropy. Three Co-Cr films with perpendicular coercivities (Hu) of 11, 90 and 170 kAlm are investigated.Besides the Hc.l seveml other parameters were studied by VSM, SEM, NMR, MFM, AFM, selective etching, such as the Hufl\ , Cr-segregation, domain structure, column sizes, etc.The anomalous Hall effect (AHE) has been used to record the hysteresis curves of sub-micron Hall crosses. This very sensitive technique in combination with e-beam lithography and ion-beam etching resulted in the recording of AHE hysteresis loops with dimensions of the Hall crosses as small as 0.3 x 0.3 J.Ul1 2 • The AHE-loops of three samples, with less than 60 columns, show ditT.erent magnetic properties and the total number of steps measured in the hysteresis loop was 5 times the number of columns. The different reversal mechanism observed by the AHE are related to differences in microstructure, coercivity and domain size. The analysis of AHE hysteresis loops we conclude that magnetic units on the limit of superparamagnetism could be present in Co-Cr. The obtained results have been used as input for our model for micromagnetic simulations. Micromagnetic simulations shows that the initial layer and the exchange coupling of the initial layer with the columns has a large effect on the magnetisation reversal processes in the film.

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Section: Discussionmentioning

confidence: 99%

Section: Anomalous Hall Measurements On Sub-micron Samplesmentioning

confidence: 99%