Pervasive artifacts revealed from magnetometry measurements of rare earth-transition metal thin films

Mandru, Andrada-Oana; Yıldırım, O.; Marioni, Miguel A.; Rohrmann, H.; Heigl, Michael; Ciubotariu, Oana-Tereza; Penedo, Marcos; Zhao, Xue; Albrecht, Manfred; Hug, Hans J.

doi:10.1116/1.5135504

Cited by 12 publications

(7 citation statements)

References 42 publications

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“…Together, these results provide important insights into the proximity of T A C and T M for alloy design. On account of the calculated values of ∆S mag for the current study, we observed similar values for CCIF-FH and MRIT as in line with other studies [11,14,20,[23][24][25][26], however, there exists a discrepancy between the calculated values of ∆S mag for and CCIF-FC and MRIT. This is mainly because a smaller amount of the sample is allowed to convert to martensite at 5 T during the FH process with respect to FC process which is shown in figure 3(b).…”

Section: Resultssupporting

confidence: 89%

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Investigation of the inverse magnetocaloric effect with the fraction method

Yuce,

Kavak,

Yildirim

et al. 2023

J. Phys.: Condens. Matter

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In this study, we examine Ni49Nb1Mn36In14 (nom. at.%) magnetic shape memory alloy (MSMA) to illustrate the inverse magnetocaloric effect using the fraction method. The magnetic entropy change, ∆S_mag, was calculated with both, the fraction method and the thermomagnetic Maxwell relation. Our results demonstrate that there exists a large magnetization difference between field-cooling and field-heating histories in Ni49Nb1Mn36In14 (nom. at.%) MSMA, which can be attributed to the pinning of lattice entropy and magnetic entropy, as it is well-known that the temperature and applied magnetic fields have an opposing effect on the total entropy change. In addition, we describe the inverse magnetocaloric effect and the contradictory roles on the total entropy change between the two stimuli via the fraction method.

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Section: Resultssupporting

confidence: 89%

“…Sample mass was determined with 0.01 mg accuracy before the magnetic measurements and placed into plastic capsules and measured with a contamination-free half-cylinder brass sample holder. Contamination and the reproducibility of the measurements were regularly controlled as described in [20].…”

Section: Methodsmentioning

confidence: 99%

Investigation of the inverse magnetocaloric effect with the fraction method

Yuce,

Kavak,

Yildirim

et al. 2023

J. Phys.: Condens. Matter

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“…Magnetometry measurements. The bulk magnetic properties of the samples were determined 38 by vibrating sample magnetometry (VSM) using a 7 T Quantum Design system. The measurements were performed at 300 K for both in-plane and out-of-plane geometries and in fields of up to 4 T. All samples were measured using the same VSM holder and each measurement was repeated several times.…”

Section: Methodsmentioning

confidence: 99%

Coexistence of distinct skyrmion phases observed in hybrid ferromagnetic/ferrimagnetic multilayers

et al. 2020

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Materials hosting magnetic skyrmions at room temperature could enable compact and energetically-efficient storage such as racetrack memories, where information is coded by the presence/absence of skyrmions forming a moving chain through the device. The skyrmion Hall effect leading to their annihilation at the racetrack edges can be suppressed, for example, by antiferromagnetically-coupled skyrmions. However, avoiding modifications of the inter-skyrmion distances remains challenging. As a solution, a chain of bits could also be encoded by two different solitons, such as a skyrmion and a chiral bobber, with the limitation that it has solely been realized in B20-type materials at low temperatures. Here, we demonstrate that a hybrid ferro/ferri/ferromagnetic multilayer system can host two distinct skyrmion phases at room temperature, namely tubular and partial skyrmions. Furthermore, the tubular skyrmion can be converted into a partial skyrmion. Such systems may serve as a platform for designing memory applications using distinct skyrmion types.

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“…The measurements were performed at 300 K for in-plane (IP) and out-of-plane (OOP) sample geometries and in fields of up to 2 T. All samples were measured by using the same VSM holders (i.e., one dedicated for IP and another one for OOP measurements). In addition, the background signal coming from the VSM holder and bare Si substrates was periodically checked to ensure a clean magnetic signal coming from only the trilayers or from the individual FM and FI layers.…”

Section: Methodsmentioning

confidence: 99%

Tuning the Coexistence Regime of Incomplete and Tubular Skyrmions in Ferromagnetic/Ferrimagnetic/Ferromagnetic Trilayers

Yıldırım

Tomasello

Feng

et al. 2022

ACS Appl. Mater. Interfaces

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The development of skyrmionic devices requires a suitable tuning of material parameters to stabilize skyrmions and control their density. It has been demonstrated recently that different skyrmion types can be simultaneously stabilized at room temperature in heterostructures involving ferromagnets, ferrimagnets, and heavy metals, offering a new platform of coding binary information in the type of skyrmion instead of the presence/absence of skyrmions. Here, we tune the energy landscape of the two skyrmion types in such heterostructures by engineering the geometrical and material parameters of the individual layers. We find that a fine adjustment of the ferromagnetic layer thickness, and thus its magnetic anisotropy, allows the trilayer system to support either one of the skyrmion types or the coexistence of both and with varying densities.

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Pervasive artifacts revealed from magnetometry measurements of rare earth-transition metal thin films

Abstract: Note: This paper is part of the Special Topic Collection on 30 years of the Nellie Yeoh Whetten Award -Celebrating the Women of the AVS.

Cited by 12 publications

References 42 publications

Investigation of the inverse magnetocaloric effect with the fraction method

Investigation of the inverse magnetocaloric effect with the fraction method

Coexistence of distinct skyrmion phases observed in hybrid ferromagnetic/ferrimagnetic multilayers

Tuning the Coexistence Regime of Incomplete and Tubular Skyrmions in Ferromagnetic/Ferrimagnetic/Ferromagnetic Trilayers

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