Tunable magnetic thermal hysteresis in transition metal (Fe, Co, CoNi)/rare earth (Gd) multilayers

Demirtas, Sezen; Hossu, Maria R.; Camley, R. E.; Mireles, Hector C.; Köymen, A. R.

doi:10.1103/physrevb.72.184433

Cited by 39 publications

(27 citation statements)

References 18 publications

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“…Figure 3 shows that the reversal condition is FM should reverse with m AF in the field direction. This is similar to some ferrimagnet Gd-Co [15] and multilayer systems Co/Gd [16], which results from two antiferromagnetically coupled spin species competing to align with the field. In this case, the two magnetizations can be clearly identified and its total moment at a low enough temperature is always positive.…”

Section: The Reversal Condition Becomes H Eb (T) ~ H Fc ± H C (T) Whsupporting

confidence: 75%

Anomalous Spontaneous Reversal in Magnetic Heterostructures

Miller

Eisenmenger

et al. 2006

INTERMAG 2006 - IEEE International Magnetics Conference

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We observe a thermally induced spontaneous magnetization reversal of epitaxial ferromagnet/antiferromagnet heterostructures under a constant applied magnetic field. Unlike any other magnetic system, the magnetization spontaneously reverses, aligning anti-parallel to an applied field with decreasing temperature. We show that this unusual phenomenon is caused by the interfacial antiferromagnetic coupling overcoming the Zeeman energy of the ferromagnet. A significant temperature hysteresis exists, whose height and width can be tuned by the field applied during thermal cycling. The hysteresis originates from the intrinsic magnetic anisotropy in the system. The observation of this phenomenon leads to open questions in the general understanding of magnetic heterostructures. Moreover, this shows that in general heterogeneous nanostructured materials may exhibit unexpected phenomena absent in the bulk.

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Section: The Reversal Condition Becomes H Eb (T) ~ H Fc ± H C (T) Whsupporting

confidence: 75%

Anomalous Spontaneous Reversal in Magnetic Heterostructures

Miller

Eisenmenger

et al. 2006

INTERMAG 2006 - IEEE International Magnetics Conference

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“…The Gd-aligned state is held stable by the iron anisotropy as the temperature is increased beyond the compensation temperature. 2,3 Similar features are also seen in other transition-metal/rare-earth metal multilayers with antiferromagnetic interface exchange coupling. 4,5 The thermal hysteresis of thin Dy films 6 is due to the combined effect of the strong temperature dependence of the magnetization and the hexagonal anisotropy, and surface effects which produce interesting modifications in the helical phase in confined geometries.…”

Section: Introductionsupporting

confidence: 56%

“…2,3 In these systems, the Fe layers are antiferromagnetically coupled to the Gd layers, and there are two states that are stable at the same temperature. At high temperatures, the system is in an Fe-aligned state ͑AS͒, with the iron spins along the external field and with the small Gd moments opposite to the external field.…”

Section: Introductionmentioning

confidence: 99%

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

et al. 2009

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We report a theoretical investigation of thermal hysteresis of fourfold anisotropy ferromagnetic ͑FM͒ film exchange coupled to a compensated antiferromagnetic substrate. Thermal hysteresis occurs if the temperature interval includes the reorientation transition temperature, below which the frustration of the interface exchange coupling leads to a 90°rotation of the magnetization of the ferromagnetic layer. The temperature width of the thermal hysteresis is tunable by external magnetic fields of modest magnitude, with values of 43 K for an external field of 110 Oe and of 14 K for a field of 210 Oe, for a Fe͑12 nm͒ / MnF 2 ͑110͒ bilayer. For a Fe͑3 nm͒ / FeF 2 ͑110͒ bilayer the width of the thermal hysteresis is 23 K at 110 Oe and 13 K at 300 Oe. We discuss how the thickness of the iron film affects the field tuning of the thermal hysteresis width, and also how the thermal loops may be used to identify the nature of the interface exchange energy.

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“…[1][2][3][4][5][6][7][8][9][10][11] In thin films, magnetic configurations such as in-plane domain walls ͑DWs͒ appear due to the exchange coupling between the Gd and the TMs at the multilayer interfaces. [1][2][3][4][5][6][7][8][9][10][11] In thin films, magnetic configurations such as in-plane domain walls ͑DWs͒ appear due to the exchange coupling between the Gd and the TMs at the multilayer interfaces.…”

Section: Introductionmentioning

confidence: 99%

In-plane magnetotransport properties of Permalloy∕gadolinium∕Permalloy trilayers

Ranchal

Aroca²,

López

2006

Journal of Applied Physics

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In this work we report on the magnetic and electrical properties of Permalloy/gadolinium/Permalloy ͑Py/Gd/Py͒ trilayers at low temperatures. These results are complemented with a structural study and numerical calculations. The Py-Gd coupling field is derived from magnetoresistance measurements in the transverse configuration of the trilayer with a Permalloy thickness lower than its exchange correlation length. The coupling field obtained was low, likely due to the presence of low Curie temperature Gd 1−x Ni x alloys at the Py/Gd interfaces.

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Tunable magnetic thermal hysteresis in transition metal (Fe, Co, CoNi)/rare earth (Gd) multilayers

Cited by 39 publications

References 18 publications

Anomalous Spontaneous Reversal in Magnetic Heterostructures

Anomalous Spontaneous Reversal in Magnetic Heterostructures

Thermal hysteresis of ferromagnetic/antiferromagnetic compensated bilayers

In-plane magnetotransport properties of Permalloy∕gadolinium∕Permalloy trilayers

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