Modeling the thickness dependence of the magnetic phase transition temperature in thin FeRh films

Ostler, Thomas; Barton, Christopher; Thomson, Thomas; Hrkac, G.

doi:10.1103/physrevb.95.064415

Cited by 20 publications

(24 citation statements)

References 39 publications

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“…In magnetic systems the source of this frustration is the inability to fully resolve the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange coupling present in the system 15 . In the case of FeRh the inability to resolve all the exchange interactions within the region between the two magnetic phases may also contribute to this behavior 49 . It is likely that both factors contribute to the jammed behavior seen in the XMCD measurements in Fig.…”

Section: Stretching Exponent Behaviormentioning

confidence: 99%

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

et al. 2020

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The phase coexistence present through a first-order phase transition means there will be finite regions between the two phases where the structure of the system will vary from one phase to the other, known as a phase boundary wall. This region is said to play an important but unknown role in the dynamics of the first-order phase transitions. Here, by using both x-ray photon correlation spectroscopy and magnetometry techniques to measure the temporal isothermal development at various points through the thermally activated first-order metamagnetic phase transition present in the near-equiatomic FeRh alloy, we are able to isolate the dynamic behavior of the domain walls in this system. These investigations reveal that relaxation behavior of the domain walls changes when phase coexistence is introduced into the system and that the domain wall dynamics is di↵erent to the macroscale behavior. We attribute this to the e↵ect of the exchange coupling between regions of either magnetic phase changing the dynamic properties of domain walls relative to bulk regions of either phase. We also believe this behavior comes from the influence of the phase boundary wall on other magnetic objects in the system.

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Section: Stretching Exponent Behaviormentioning

confidence: 99%

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

et al. 2020

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“…T jump is known to be tunable in a wide temperature range [16,41,42]. To quantify the exchangemodulation function of the Fe-Rh layer, we use [43] A iex ðTÞ A iex ð0Þ ¼ α tanh…”

Section: Grainmentioning

confidence: 99%

“…According to measurements of Fe-Rh thin films in Refs. [40,43], we use a typical value of ΔT ¼ 20 K. The scaling and offset parameters are computed from the requirement of the remaining exchange-coupling fraction r ex well below…”

Section: Grainmentioning

confidence: 99%

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

et al. 2017

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High storage density and high data rate are two of the most desired properties of modern hard disk drives. Heat-assisted magnetic recording (HAMR) is believed to achieve both. Recording media, consisting of exchange-coupled grains with a high and a low T C part, were shown to have low dc noise-but increased ac noise-compared to hard magnetic single-phase grains like FePt. We extensively investigate the influence of an Fe-Rh interlayer on the magnetic noise in exchange-coupled grains. We find an optimal grain design that reduces the jitter in the down-track direction by up to 30% and in the off-track direction by up to 50%, depending on the head velocity, compared to the same structures without FeRh. Furthermore, the mechanisms causing this jitter reduction are demonstrated. Additionally, we show that, for short heat pulses and low write temperatures, the switching-time distribution of the analyzed grain structure is reduced by a factor of 4 compared to the same structure without an Fe-Rh layer. This feature could be interesting for HAMR use with a pulsed laser spot and could encourage discussion of this HAMR technique.

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“…A large number of recent experimental and theoretical studies have shown that the order-disorder phase transition in magnetic ultra-thin films may differ significantly from that in the corresponding bulk systems [3,7,10]. In the general case, the phase transition temperature (Curie temperature for the ferromagnetic (FM) thin film and Néel temperature for the antiferromagnetic (AFM) thin film) of the ultrathin films is lower than that in the bulk and decreases when the thickness of the film reduces.…”

Section: Introductionmentioning

confidence: 99%

“…The free energy of the thin film is calculated as follows: with the experimental results given in [7] and [10].…”

Section: Introductionmentioning

confidence: 99%

Phase transition in magnetic ultra-thin films

Thảo

Thuận

Ny³

2019

HueUni-JNS

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<p>In this paper, we study influence of surface anisotropy on the phase transition in antiferromagnetic and ferromagnetic ultra-thin films by using functional integral method. Besides, spin fluctuations are also given to illustrate for these phase transitions. We find that the phase transition temperature of the ultra-thin films may be higher or lower than the phase transition temperature of the corresponding bulk systems, which depends on the surface anisotropy. Moreover, we also determine crossover points at which the phase transition temperature is not influenced by the thickness of the thin film.</p>

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Modeling the thickness dependence of the magnetic phase transition temperature in thin FeRh films

Cited by 20 publications

References 39 publications

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

Noise Reduction Based on an Fe−Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media

Phase transition in magnetic ultra-thin films

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