Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    The effects of pinning magnetization with geometrical features in thin permalloy films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6519-6521 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work considers the use of geometric alterations to the edges of a strip of thin magnetoresistive material used to make a magnetometer device. The geometric features in the form of narrow fins are intended to improve the performance of the device by pinning the magnetization at the strip edges at an angle corresponding to the high sensitivity region of the magnetoresistance curve, thus including this region in the contribution to total resistance change. Both theoretical calculations using a micromagnetic model and experimental work on a prototype device are described. Results show that the device behaves closely to the modeling predictions, exhibiting a large sensitivity of 17 μV/V/μT, 70% greater than a more conventional device, with the additional capability of a trimmable orthogonal field rejection. Differences between the predicted and measured devices are described in terms of the shortcomings of the model and to domain activity in the device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352600
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Magnetization distributions in thin film Permalloy strips : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5862-5864 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin film Permalloy strips are used extensively for magnetoresistive sensors both in magnetometry and magnetic recording. A determination of magnetization distributions is vital to allow optimization of sensor performance. Results from a previously described scanning laser microscope (SLM) unambiguously determine magnetization distributions to submicron resolution. Operating the SLM in a mode sensitive to magnetization angles about the long axis of the strip shows typical closure domains. If the mode is sensitive to fluctuations about the strip short axis then light and dark bands are observed. These results indicate that the magnetization is not parallel with the strip edges within the domains as normally considered for closure domains. The SLM images are compared with results from a previously described numerical micromagnetic model. Results from the model compare well with those from the SLM, confirming the ability of the model to reliably predict domain activity in Permalloy strips. Results are shown for Permalloy strips of approximately 15 μm×50 μm and 250 A(ring) thick in the presence of dc and ac magnetic fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347849
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of permalloy-tantalum multilayer thin films : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4526-4528 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work describes a detailed investigation into the magnetic and structural properties of permalloy-tantalum multilayered thin films produced by vacuum evaporation. Their microstructure was investigated using high-resolution TEM and the magnetic properties were measured with vibrating-sample and vibrating-reed magnetometers. The results show a reduction in coercivity for the multilayer films which is independent of the number of layers but depends strongly on the magnetic layer thickness. The tantalum layer is shown to be continuous and microcrystalline down to 25-A(ring) thickness, but the interface between the layers is irregular and may give rise to additional magnetostatic coupling as the tantalum layer thickness is reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348348
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The role of dipole coupling in multilayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5978-5980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This work considers the role of magnetic dipole coupling in multilayers typically comprising a ferromagnetic material separated by a nonmagnetic metal spacer, e.g., NiFe/Ta. It has been suggested previously that dipolar fields may play an important role in the coupling of magnetic layers through a nonmagnetic spacer, in particular where surface roughness at the interface is significant. This work considers a first-order calculation of the dipole coupling energy and magnetic field between two adjacent layers. It is shown that dipole coupling energies originating from surface corrugations can behave in the same manner as a coercive field in terms of dependence on nonmagnetic spacer thickness and the degree of roughness. Interestingly, calculations also show that both ferromagnetic- and antiferromagnetic-like coupling can be explained in terms of this model. The role of the spacer thickness, magnetic layer thickness, and the form of the roughness is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353489
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The effect of deposition process on the magnetic properties of coupled permalloy thin films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6365-6367 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Double layer thin films of permalloy (layer thickness 200–1300 A(ring)) with tantalum (50 A(ring)) as a nonmagnetic spacer have been prepared by e-beam evaporation. The effect of deposition parameters, especially the substrate temperature on the magnetic properties of these films has been examined. The coercivity(Hc) of the double layer films was found to be very sensitive to the substrate temperature in the permalloy layer thickness range of 200–600 A(ring). The coercivity of the films deposited at 40 °C is lower than at 300 °C and is almost independent of the Permalloy layer thickness. The XRD patterns and STM images of these two films exhibit large differences in permalloy grain size and grain orientation. However, the Hc of the single layer films deposited under the same conditions as the double layer films shows no significant change in this thickness region. The results indicate that the change of interface condition is primarily responsible for the Hc variation in the coupled films deposited at different substrate temperatures and strongly suggest that interface roughness plays a dominant role in the coupling between the permalloy layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352650
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Pre-school visually impaired children: visual stimulation and micro-computers (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Child 19 (1993), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Summary A justification is offered for using micro-computers and specially-designed programs with severely visually impaired pre-school children. It is argued that this technology optimizes the visual environment for the child and provides immediate feedback about the correctness of his responses to the stimuli displayed on the screen. Some of the problems encountered in such use are described, with examples taken from sessions in which teachers are working with children as young as 2 years of age, using teaching/learning sequences designed to promote and exercise visual perception skills. Among the issues addressed are the nature of the language interactions between child and adult, the effects of altering the complexity of the tasks, and the possible value of formal task analysis as a means of enabling the teacher to pinpoint critical stages in the learning process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2214.1993.tb00710.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Reciprocity based transfer function analysis in magnetic force microscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1726-1728 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transfer function of the imaging process in magnetic force microscopy is calculated theoretically using a reciprocal force based approach. The reciprocal force is that exerted on the sample by the tip, and according to Newton's third law, is simply equal but opposite to the force exerted on the tip by the sample. The method allows the role of the tip in the imaging process to be represented in a particularly simple fashion, and the system transfer function is shown to depend on the Fourier transform of the field distribution produced by the microscope tip at the surface of that tip, an exponential spacing loss term reflecting the separation of the tip and the sample and finally a loss term dependent on the sample thickness. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115888
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Automated magnetization measurements (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3208-3210 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An automated vibrating sample magnetometer (VSM) has been constructed in order to facilitate measurements of the magnetization of conducting samples of different fields and temperatures over a period of time. The principal features of the VSM are large amplitude oscillations, low-frequency, stable horizontal sinusoidal motion, a 12-coil detection system to allow compensation for image effects, and a state-of-the-art automated detection system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338903
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Reciprocity in magnetic force microscopy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 433-435 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical treatment for contrast formation in the magnetic force microscope is given which relies on calculation of the force acting on the sample, rather than the more usual method which calculates the force acting on the microscope tip. The equivalence of this reciprocal force method is demonstrated by calculating the theoretical image for longitudinal step and arctangent magnetization transitions in thin-film recording media. The reciprocal force approach leads naturally to unambiguous definitions for the resolution of the magnetic force microscope and it is shown that conventional resolution measures, such as impulse response, line-spread function and step response, used in many other forms of microscopy, may be readily applied to the magnetic force microscope. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114623
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Homogeneous carbon monoxide hydrogenation on multiple sites: a dissociative pathway to oxygenates (1979)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 101 (1979), S. 7417-7419 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00518a055
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...