Micromagnetic Analysis of Statistical Switching in Perpendicular STT-MRAM With Interfacial Dzyaloshinskii–Moriya Interaction

Autor: A. La Corte, Giovanni Finocchio, Anna Giordano, Pietro Burrascano, Mario Carpentieri, Vito Puliafito, Bruno Azzerboni, Riccardo Tomasello, Giulio Siracusano
Rok vydání: 2017
Předmět:
STT-magnetic random-access memory (MRAM)
Higher order statistics
Magnetic recording
Magnetic storage
Probability density function
Random access storage
Statistical methods
Switching
skewness
Probability density function
02 engineering and technology
Dzyaloshinskii–Moriya interaction
kurtosis
skewness
spin-transfer torque (STT)
STT-magnetic random-access memory (MRAM)
write error rate (WER)
01 natural sciences
Electronic mail
Standard deviation
Switching time
0103 physical sciences
spin-transfer torque (STT)
Electrical and Electronic Engineering
Micromagnetics
Dzyaloshinskii-Moriya interaction
010302 applied physics
Physics
Condensed matter physics
Dzyaloshinskii–Moriya interaction
kurtosis
write error rate (WER)
021001 nanoscience & nanotechnology
Electronic
Optical and Magnetic Materials
Skewness
Kurtosis
0210 nano-technology
Order of magnitude
Zdroj: IEEE Transactions on Magnetics. 53:1-5
ISSN: 1941-0069
0018-9464
DOI: 10.1109/tmag.2017.2708125
Popis: The technological implementation of STT-magnetic random-access memory (MRAM) in real devices needs a complete description of the statistical switching behavior at room temperature. In this paper, we investigate, by means of a full micromagnetic model, the effect of the interfacial Dzyaloshinskii–Moriya interaction (IDMI) on the critical current density and probability density function (PDF) of the switching time in perpendicular STT-MRAMs. We show that for large enough values of the symmetric exchange interaction, the negative effect of the IDMI on the critical current is strongly reduced. In addition, a comprehensive analysis of the four main statistical moments (mean, standard deviation, skewness, and kurtosis) points out that to fit the switching time PDF in order to maintain a quadratic error at least one order of magnitude smaller than skew normal PDF, a Pearson type IV PDF has to be used also in presence of the IDMI.
Databáze: OpenAIRE
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