Textbook treatments of the hysteresis loop for ferromagnets—Survey of misconceptions and misinterpretations

Rudowicz, Czesław; Sung, H.W.F.

doi:10.1119/1.1583696

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…Since the pulse amplitude can always be selected high enough to flip the magnetization while the voltage rises, and the voltage drop can always be selected slow enough to avoid the reverse flipping of magnetization, it is evident that the "Φ-memristor" would fail the test since its final state would be different than the initial one, after the capacitor has fully discharged. We emphasize that this conclusion can be reached based simply on the well-documented threshold property of magnetization reversal [4].…”

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confidence: 76%

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Φ memristor: Real memristor found

Wang

Shi

et al. 2019

Journal of Applied Physics

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Wang et al. claim [J. Appl. Phys. 125, 054504 (2019)] that a current-carrying wire interacting with a magnetic core represents a memristor. Here, we demonstrate that this claim is false.We first show that such memristor "discovery" is based on incorrect physics, which does not even capture basic properties of magnetic core materials, such as their magnetic hysteresis. Moreover, the predictions of Wang et al.'s model contradict the experimental curves presented in their paper. Additionally, the theoretical pinched hysteresis loops presented by Wang et al. can not be reproduced if their model is used, and there are serious flaws in their "negative memristor" emulator design. Finally, a simple gedanken experiment shows that the proposed Φ-memristor would fail the memristor test we recently suggested in J. Phys. D: Appl. Phys. 52, 01LT01 (2019). The device "discovered" by Wang et al. is just an inductor with memory.

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confidence: 76%

“…Ferrimagnets are characterized by hysteretic magnetization loops, similar to the loops of ferromagnets (see, e.g., Refs. [4] and [5]). In Fig.…”

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confidence: 99%

Φ memristor: Real memristor found

Wang

Shi

et al. 2019

Journal of Applied Physics

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“…The coercivity H C is defined 2 as the value of H in the negative direction that is required to get B = 0. The intrinsic coercivity H Ci is the reverse field required to remove the magnetization in a plot of M versus H. [7] The hysteresis loop is symmetric around the origin. Heat is generated for each cycle around the hysteresis loop.…”

Section: Types Of Magnetismmentioning

confidence: 99%

Magnetic materials

2023

Principles of Magnetostatics

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We saw in the previous chapter that magnetic fields are produced in a vacuum by currents in conductors. In this chapter, we will consider magnetic effects associated with matter. All materials have spin and orbital motion of charges at the atomic scale. For most materials, the random orientations of these internal currents tend to cancel out significant magnetic effects. However, in certain magnetic materials, such as iron or permanent magnets, these internal currents do not cancel, and there is a net external effect that also produces or enhances magnetic fields. In the field theory we have been discussing, the magnetic field B must be a continuous function of position. Thus, in magnetic materials, the macroscopic field B must be an average of the rapidly varying local fields surrounding the atoms in the material. [1]

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“…As indicated in the literature, although the content of the topics are correct in textbooks, differentiations at the presentation of content may cause difficulties for the students (Justi & Gilbert, 2002;Rudowicz & Sung, 2003;Gericke & Hagberg, 2010). As such, the textbooks commonly used as source books for modern physics courses in Turkey were examined in order to determine whether there were similarities/differences in content and presentation for related topics.…”

Section: Issn 1648-3898mentioning

confidence: 99%

Student Difficulties in Solving Problems Concerning Special Relativity and Possible Reasons for These Difficulties

Tanel

2014

JBSE

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There are two main purposes of this study. The first is to determine the basic difficulties of students in solving problems about the theory of special relativity, and the second is to identify the possible causes leading to these difficulties. To achieve these goals, 3 open-ended questions were administered to the participants. These questions were answered by 78 students who had been enrolled in a modern physics course. Out of 78 students, 24 students were selected for interviewing. Commonly used textbooks were also analyzed in order to determine whether there are differences in content. The results of the analysis showed that the students had difficulties in selecting the proper frames of reference. In addition, they could not use the concepts included in the fundamental equations accurately in accordance with their meanings. The main reasons behind these difficulties seem to be the improper generalizations of students. Moreover, the different representations of the fundamental equations in the various textbooks were also seen as the reason for the difficulties students encountered. Key words: problem solving, student difficulties, special relativity.

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Textbook treatments of the hysteresis loop for ferromagnets—Survey of misconceptions and misinterpretations

Cited by 14 publications

References 2 publications

Φ memristor: Real memristor found

Φ memristor: Real memristor found

Magnetic materials

Student Difficulties in Solving Problems Concerning Special Relativity and Possible Reasons for These Difficulties

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